diff --git a/src/engine/blocks.js b/src/engine/blocks.js
index d19e6fc34..1e22bf73e 100644
--- a/src/engine/blocks.js
+++ b/src/engine/blocks.js
@@ -296,6 +296,12 @@ class Blocks {
         case 'endDrag':
             if (optRuntime) {
                 optRuntime.emitBlockDragUpdate(false /* areBlocksOverGui */);
+
+                // Drag blocks onto another sprite
+                if (e.isOutside) {
+                    const newBlocks = adapter(e);
+                    optRuntime.emitBlockEndDrag(newBlocks);
+                }
             }
             break;
         case 'delete':
diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index 621c7bd7a..4da25f7bd 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -387,6 +387,13 @@ class Runtime extends EventEmitter {
         return 'BLOCK_DRAG_UPDATE';
     }
 
+    /**
+     * Event name for block drag end.
+     * @const {string}
+     */
+    static get BLOCK_DRAG_END () {
+        return 'BLOCK_DRAG_END';
+    }
 
     /**
      * Event name for reporting that an extension was added.
@@ -1404,6 +1411,14 @@ class Runtime extends EventEmitter {
         this.emit(Runtime.BLOCK_DRAG_UPDATE, areBlocksOverGui);
     }
 
+    /**
+     * Emit event to indicate that the block drag has ended with the blocks outside the blocks workspace
+     * @param {Array.<object>} blocks The set of blocks dragged to the GUI
+     */
+    emitBlockEndDrag (blocks) {
+        this.emit(Runtime.BLOCK_DRAG_END, blocks);
+    }
+
     /**
      * Emit value for reporter to show in the blocks.
      * @param {string} blockId ID for the block.
diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index 25d98d562..dd9c45e90 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -10,7 +10,6 @@ const sb3 = require('./serialization/sb3');
 const StringUtil = require('./util/string-util');
 const formatMessage = require('format-message');
 const Variable = require('./engine/variable');
-const adapter = require('./engine/adapter');
 
 const {loadCostume} = require('./import/load-costume.js');
 const {loadSound} = require('./import/load-sound.js');
@@ -41,11 +40,6 @@ class VirtualMachine extends EventEmitter {
          */
         this.editingTarget = null;
 
-        /**
-         * ID of sprite that mouse is hovered over in sprite selector, if any
-         */
-        this._hoveredSpriteId = null;
-
         /**
          * The currently dragging target, for redirecting IO data.
          * @type {Target}
@@ -83,6 +77,9 @@ class VirtualMachine extends EventEmitter {
         this.runtime.on(Runtime.BLOCK_DRAG_UPDATE, areBlocksOverGui => {
             this.emit(Runtime.BLOCK_DRAG_UPDATE, areBlocksOverGui);
         });
+        this.runtime.on(Runtime.BLOCK_DRAG_END, blocks => {
+            this.emit(Runtime.BLOCK_DRAG_END, blocks);
+        });
         this.runtime.on(Runtime.EXTENSION_ADDED, blocksInfo => {
             this.emit(Runtime.EXTENSION_ADDED, blocksInfo);
         });
@@ -559,14 +556,6 @@ class VirtualMachine extends EventEmitter {
         });
     }
 
-    /**
-     * Sets the hovered sprite
-     * @param {string} targetId ID of a target whose sprite is hovered.
-     */
-    setHoveredSprite (targetId) {
-        this._hoveredSpriteId = targetId;
-    }
-
     /**
      * Set the audio engine for the VM/runtime
      * @param {!AudioEngine} audioEngine The audio engine to attach
@@ -610,27 +599,6 @@ class VirtualMachine extends EventEmitter {
     blockListener (e) {
         if (this.editingTarget) {
             this.editingTarget.blocks.blocklyListen(e, this.runtime);
-
-            // Validate event
-            if (typeof e !== 'object') return;
-            if (typeof e.blockId !== 'string' && typeof e.varId !== 'string') {
-                return;
-            }
-
-            // Drag blocks onto another sprite
-            if (e.type === 'endDrag' &&
-                    e.isOutside &&
-                    this._hoveredSpriteId &&
-                    this._hoveredSpriteId !== this.editingTarget.id) {
-                const dragTarget = this.runtime.getTargetById(this._hoveredSpriteId);
-                if (dragTarget) {
-                    // TODO tell gui to tell blocks to undo, to cause the blocks to move back into place.
-                    const newBlocks = adapter(e);
-                    for (let i = 0; i < newBlocks.length; i++) {
-                        dragTarget.blocks.createBlock(newBlocks[i]);
-                    }
-                }
-            }
         }
     }
 
@@ -690,6 +658,19 @@ class VirtualMachine extends EventEmitter {
         }
     }
 
+    /**
+     * Called when blocks are dragged from one sprite to another. Adds the blocks to the
+     * workspace of the given target.
+     * @param {!Array<object>} blocks Blocks to add
+     # @param {!string} targetId Id of target to add blocks to.
+     */
+    shareBlocksToTarget (blocks, targetId) {
+        const target = this.runtime.getTargetById(targetId);
+        for (let i = 0; i < blocks.length; i++) {
+            target.blocks.createBlock(blocks[i]);
+        }
+    }
+
     /**
      * Repopulate the workspace with the blocks of the current editingTarget. This
      * allows us to get around bugs like gui#413.