Preventing change in direction from collisions

Hey, I have enemies scripted to move in a straight line towards an end point. however when arrows collide with them and the enemy destroys the arrow the enemy is "pushed" more towards the direction it was hit from as if it is absorbing some of the force from the impact. Any ideas how to prevent this?

Increase the enemies' mass, or decrease the arrows' mass, or both.

ahh turns out increasing the drag did the trick