There was a lot of deleted dialogue for this mission, including a part where when the police officer gets cut up by the hellicopter, an ear lands in ryders lap xDMoFoe 16:02, August 15, 2010 (UTC)
oh really show me your proof
So,basically i have an idea that the SWAT arriving was a set-up by Smoke.
It actually makes a lot of sense:All the set leaders would be there,so they could essentialy wipe out Grove in one swipe,and that was alredy in Smoke's plan,so he informed C.R.A.S.H. who in turn informed the SWAT,in an attempt to do in which they seemingly succeded in the next mission.
Smoke and Ryder returned to see how things were going,and,as seeing Sweet and Carl alive,they thought it would be a better idea to spare them until there is a next meeting like the one in the motel.
If i am wrong,please tell me your arguments.