Not sure if any of you have noticed this but when you shoot off BRUTUS's helmet he drops 2 smoke bombs. I looked at it in theatre and just before he is ready to resume attacking 2 grenades drop from his hands than explode in smoke.
If this is old than just say its old
Pretty hard not to notice as the room gets filled with smoke each time.
The smoke grenades are strapped to his chest when he spawns.
Not sure if you shoot them but right before he resumes fighting after his helmet falls off he drops 2 smoke grenades from his hands. Look at it in theatre mode.