Answer: This is an example of INSTRUMENTAL AGGRESSION.
Explanation: Instrumental aggression can be defined as an act of initiating hostilities or launching attacks in order to achieve a goal. It is made against another individual to obtain an outcome or achieve a reward.
This is clearly an example of what Mike a seventh grader did. Showing hostility and launching attacks, (aggression) in order to achieve a goal( collect the coat of the person he's showing aggression towards.)