that calm an authoritative voice on the radio is almost certainly not that of the captain.
Who said what and when on the radio when depends on who was doing the take-off, and there was almost certainly more than one voice.
If done according to script:
The Non-handler (so that could have been either the captain or the co-pilot) should have done the "stopping" call ...
The co-pilot should have made the "mayday" call.
The captain should have made the call to ATC that they were evacuating
That said the captain can operate outside the SOPs if he/she feels fit and I think they did ***** well to get them all done (probably a sim check "exceed" just for that ), I'm not fussed who did what on the R/T to be honest.