If I have a conc primed and someone calls me, I'll toss it to the side and help em out. But only if they call me. Med has typically been an O class in TFC and not as helpful at times on defense as they could be. But I'll help anyone that calls me...even enemy spys.
You don't have time to look around at everyone's health and see if they need you if you're trying to push on offense. Call me...and I will come.