Crush
Contributor
It's not ment to be a skill as such but rather as task loading while doing other things. Part of the DM training is a gear exchange while buddy breathing, it's just ment to task load the DMC to see if they remain cool. It was kinda fun for me and Collim7 you will see on the board at times.
I did a 50 yard swim (in a pool) while buddy breathing with no mask as part of my basic OW.