This is a situation where time is of essence. So in this drill the cockpit splits into two parts. Communication with the ATC is handled by CM2 and Cabin crew calls are handled by Captain. Once ATC has been advised by FO about stopping and ECAM is ordered the captain plays no further part in the ECAM. CM2 executes all actions on his own. Captain only assesses EVAC possibility. He may have to talk to fire chief or ATC in this regard. After the FO completes ECAM and comes to EVAC REQUIRED line then they come together and CM1 will exercise one of the options. When he orders EVAC same time FO informs ATC. No wastage of precious time.