Those moments between pressing the team button and the white flash followed by them attacking you are greatly bothering me for 2 reasons.
1 - Red Roarmulus appear as the normal Roarmulus Twins before they become active. Frankly, this shouldn't have happened in the first place, as it seems like a serious oversight.
2 - For both Roarmulus and Red Roarmulus, their roars are completely silent. This is downright eerie, and it doesn't fit the mechanical precision instruments of destruction that the (Red) Roarmulus are. They are death machines, not ghosts, this shouldn't happen either.
Dunno about 1 as I've never done a Shadow Lair but 2 sounds like a bug, as for me they do roar when they show up.