If their shooting at you close-mid range and you throw the ball at them it pretty much gives you the time and advantage to finish them off. The other player is usually to confused as to why all of sudden his DMR was replaced with a skull he can't stop waving around.
"In Mass Effect 3, the path to victory is less clear at the outset. You wont just find some long-lost Reaper off button."-Casey ******* Hudson.