For example if one of the The Sisterhood was in mortal danger after underestimating the enemy (a bit like Ruth and Chokehold) and the enemy is just about to deal the killer blow, time has to be stopped literally that second, there's no time for MC to be teleported, but then with time stopped he still has to get there to save her.
		
		
	 
That situation is next to impossible based purely on the fact that there would be no way for MC to even know anyone is that close to death if they weren't within an actionable area. 
If that situation does happen, whoever it is that needs saving are dead. More than likely MC wouldn't stop time in time and they'd be killed, because someone would have to inform him of the impending death which he would have to take a least a bit of time to process. 
If any of the sisterhood were that close to getting killed, outside of a repeat of Ruth wanting to get killed, I imagine they'd simply call to get ported out of there back to base. Quick and easy. If they can't be pulled out like that, then that means MC wouldn't be able to be dropped in like that either. 
Short of MC getting super speed and or teleportation powers MC won't be pulling off and literal last second rescues using time stopping. 
Though on that note, MC copying the sisterhoods porter's power would work incredibly well for time frozen rescues. Probably, certainly with practice in real time first to get to know the power first. Animal testing would be required to make sure getting ported while frozen would be safe or relatively safe for humans.