Well, they are going to the UFO's just fine...but then you have a 2 second wait while they just sit there...and the UFO's fly away leaving the arrow stuck in mid-air. Try taking the 2 second wait out and see if that works better for you
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Well, you could use a Repeat loop, with a Move to "UFO sprite" for a certain number of iterations, instead of the Wait 2 seconds. That way, the arrow will appear on the UFO and move with it for a while, and then drop.
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