A man in the water is one rationale for having a back-up skipper in good trim. If Barker was to be injured or ill, Ashby would take over - as he would if Barker ended up in the water during a race.
Don't laugh - it can happen on these 22m catamarans when crew and skipper scuttle as fast as they can from side to side during manoeuvres.
They have to bounce/run over the catamaran's trampoline and, even though Team NZ sponsors Camper have made the crew shoes with special cleats which offer enhanced grip on the tramp, missteps can still happen.
For example, Oracle skipper James Spithill ended up in the drink after one training run last month.
He started off for one side of the boat, saw there was no one on the wheel on the other side, turned back - but fell over the wheel, breaking it and taking a bit with him as he went overboard.
"It's all about how you deal with something like that," said Beashel, "and how you continue to race at 100 per cent. You have to have people able to compete in different conditions and in different situations."