Dark Sentinal vs Burrowers

[Nargacuga]

Pretty strait forward question.

If Pyg Burrowers surface within 3" of Vayl and forfeit their movement for an aiming bonus, does dark sentinel trigger?

[Mootaz]

Forfeiting movement triggers effects that trigger on "end movement".
Just a note: The question whether or not Burrowers can aim is currently under debate (please no discussions about that in this thread) but is not relevant for this question as any other model can be used for this question.