How do I pin object to image point?

You need to pick the correct Boss instance. The easiest way is to pick by overlapping laser. But if there are lots of bosses and lasers, you need to choose another method.

Also, why do you use both the official Pin behavior and PinToImagepoint? You should choose one.

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I would do this in one event:

Every 8 seconds
For each Boss
	Boss spawn Laser
	Laser pin to Boss
	...