Answer:
Reflexive Tactics.
Step-by-step explanation:
Reflexive tactics is conducted by Building a rapport with other people who are in conflict and reflected their source of anger into something else, making them forget about it for a while to calm their mind.
This can be seen In John's action.
When watching Jill and Anthony engaged in a nasty fight, He decided to 'tells a joke at the beginning of a meeting '.
By doing this, John take away Jill's and Anthony's attention from their conflict for a while and becoming more comfortable to talk to John about their feelings.