diff --git a/examples/Animated/Flock.html b/examples/Animated/Flock.html
index 1c217eea..5bb9471c 100644
--- a/examples/Animated/Flock.html
+++ b/examples/Animated/Flock.html
@@ -287,8 +287,10 @@
 		
 		var layer = document.activeLayer;
 		function onKeyDown(event) {
-			if (event.key == 'space')
+			if (event.key == 'space') {
 				layer.selected = !layer.selected;
+				return false;
+			}
 		}
 	</script>
 	<style>
diff --git a/src/tool/ToolEvent.js b/src/tool/ToolEvent.js
index b68b1fec..08117090 100644
--- a/src/tool/ToolEvent.js
+++ b/src/tool/ToolEvent.js
@@ -127,7 +127,7 @@ var ToolEvent = this.ToolEvent = Base.extend({
 		// Instead, keep calculating the delta each time, so the result can be
 		// directly modified by the script without changing the internal values.
 		// We could cache this and use clone, but this is almost as fast...
-		return this._delta && this.tool.lastPoint
+		return !this._delta && this.tool.lastPoint
 		 		? this.tool.point.subtract(this.tool.lastPoint)
 				: this._delta;
 	},