That can easily done with 3d motion key or 2d motion key.
1)Take 2 character 2)Import syringe prop and link with hand of one charcter
3)move the hand of character toward another charcter
4) Character with syringe should be back(Z axis). so that syringe needle hide back under other charcter.
5)Change hand sprite near end of motion.
6) Use mask composer to reduce hright and withd of hand sprite near end of motion.
7) camera animtion fouces on syringe near end of motion( zoming effect)
8) collect clip yo reuse.
Thanks
IK