Agree with Sephiroth. well basicly you dont need to lure merc away from the obj. you just need to use for example smokeG. or just sticky cam him around till mask goes off totally.. and wola.. ull take obj for sure..
This is most smallest problem what i have notice in this game ,and this isnt happening so often.. atleast for me i have seen this only 1-2 times in whole time of ct.