Another term for reactive violence is violence. impulsive expressive provoked

The correct answer is expressive violence. 

Expressive violence refers to violence that is emotionally charged or emotionally driven. When it comes to expressive violence, an individual's reactions are usually excessive and disproportionate to the situation that caused them to become emotionally reactive and aggressive. Expressive violence might be verbal and/or physical. Outbursts of expressive violence tend to be brief, however they are explosive and intense. 

Icannot see any engraving so i cant answer 12.massacre means wholesale slaughter and thats what happend when they the boston citizens