The last thing they want to do is to dump the mainsheet when starting to pitchpole and the second last is to dump the traveller - that just powers the mainsail up as the boat slows and the apparent wind moves back. The best thing to do is to sheet in / traveller up quickly but that is very hard to do, especially with winches (releasing IS easy).

If you go to YouTube you can watch other regattas (Trapani is one) where boat after boat started to pitchpole and recovered, so the crews are not used to pitchpoling.