At that point, I either leave, or take a seat. There is no timer, no extra points for finishing quickly. Sometimes I skip parts, other times I kill everything, especiall when doing bounties/using consumables. If you want to be an ass and skip, and see that others aren't caught up and purposely kill yourself when you get to the boss to cause a wipe, I won't help. I'm not slow on strikes, often lead the fire team in kills and in the field, but what you are doing shows absolutely no teamwork whatsoever. In fact, it is the opposite. If you want to speed run, invite some friends.