Sentry Distraction

So I'm trying to make a game, that when a stone is fired from the player, and hits a wall, it will make a sound (represented graphically). If a sentry is close enough, it will move to the sound, and once it has disipated, the sentry will move back to the position it came from.

The issue is, I can't seem to get the sentry to go back to its original position. I'm sure it's a minor line of code, that I am overlooking, and have stripped back most of the game so it's just a basic .CAPX file.

If anyone could have a look at it for me, and solve this issue, it would be greatly appreciated <img src="smileys/smiley1.gif" border="0" align="middle" />

dl.dropbox.com/u/108799982/Capx%20Demos/Sentry.capx

The problem is when you set the angle to move back, once back, the Bounce off solid property of Bullet causes it to bounce at an angle. You need to add logic to detect when it has reached its starting point (within reason) and then reset the original angle and position.