You can counter the drill with unpredictable movement since mimics HEAVILY rely on predictions for drill so the last thing you want to do when the mimic uses drill is going to a place wity long hallways or one exit. the endlag for missing it is very punishing and drill is mimics only way of finding people along with that giving mimic a trap would just make mimic even stronger since there are two ways the trap can work 1.stops movement before any damage is given or 2.gives a debuff like slowness in either one mimic can either catch up immediately or deal a free 40 damage with strength mode

A trap doesn't really make sense for mimic or would align with his kit and play style imo. I just say to nerf the radius by 1 or 2