I have had the game glitch on me and my crew when I 'anchor' the boat just as someone attempts to teleport to me. I end up off the ship with the whole crew, and having been paid for our plundering, meanwhile, the teleporting person remains on the ship!
When I teleport back to this person, my ship in the few times this has happened, became invincible.
It is not something I have been able to repeat at will.
Zeppers lvl36
http://pirates.teamofx.us