When a Massachusetts construction worker began stabbing two co-workers on Monday, another worker used his jujitsu training to stop the attack.

Carcensky Salvent, 21, is accused of stabbing one male co-worker, who was on a ladder, four to five times in the leg and another who tried to help in the back. That’s when another co-worker, known as Lito M., was able to disarm and restrain Salvent until Cambridge police arrived, reports said, saying jujitsu taught him how to take control of the situation.