May I ask why you DC it?
Primary reason is probably because it isn't ours. Crews don't stick around in codes, we usually have plenty staffing to have a full crash room. They wait for a doc and the documenting to be in the room (usually already present on arrival), give report loudly, then are on their way with a signature to boot, Fire in tow. We don't have any to trade with, so LUCAS goes with them, and we take over compressions. Don't be mistaken though, LUCAS comes off at a logical moment (rhythm and/or pulse check) then we take over by hand when compressions are due, then maybe 2 seconds lost by getting the back part out.