Having bailed from a 60m dive on a cold Febraury dive in the channel when my loop flooded, I know how tight the gas supply in 7L is.
Talking practical experience here rather than computer models
However, if I'd aborted dive at the bottom of the shot line when the loop breathing felt odd rather than pressing on with the dive, I'd have been able to make a leisurely ascent... I think there is a lesson there!
JT