Looping? (Still need help)

[Cruzore]

as far as I know, it doesn't matter which is parent and which is child. But since I see evryone use the player as the child, you should stick to the grunt being the child, in this case your collide callback is right. However, the true you got there refers to:
bool abDeleteOnCollide
and that means it will delete after called. Which, since we want a loop, don't want. so set it to false.
That should answer your question, and you should have no problem with the timer.