I don't think I'd want to get any closer to a grounded vessel then they already are, would contact whatever the local authority (CG, HP, PD whoever) to see if they were aware of the vessel aground. If there is a way to put your own boat in a position of safety, ( other crew to heave to,
anchor) and you can investigate by dink, maybe. They took the time to put sail covers on, but didn't secure the
jib, it's just a
jib, it's already trash, not worth you risking anything even tho' it's hard for a sailor to ignore a flogging sail.