change into passive voice and underline the passive voice mr. ross broke the antique

The antique vase got broken by Mr ross when he walked through the store

Ben had used his right to defend himself, i.e., self-defense.

Explanation:

The right of Self-defense means that one person has the power and authority/right to defend for his own life, if he finds threat of being harmed by another person. The law has given right to self-defense to people in cases if they find such threats.

In the given instance, Mike had tried to swing at Ben, whereas, Ben in his self-defense shoved Mike, because he found threat of being harmed by Mike.