Well it might be important to know that the rule is different at the NF and NCAA, because coaches will think the NCAA rule applies.
This is a legal play. Look in Rule 9 where GT is located (sorry do not have my rulebook with me right now).
You only have GT when these things take place.
- Ball must be on its downward trajectory
- Ball must be completely above the rim
- Ball must have a chance to go in
- The ball must be touched on a try
Peace