Sadly, Shell has a hands-off policy so once the activists got on, they are there for the long haul and crew know they will probably be fired if they touch the activists.
Greenpeace was following them from when they departed the Far East waiting for this opportunity, and looking at Greenpeace's website, looks like the weather gave them a great opportunity. And with hand's off, it is a challenge to stop them.
My guess the heavy lift ship spends a little extra time off Port Angeles to offload these folks, as an earlier poster said, don't want to bring them in to Seattle.
Good luck to you guys on the Polar Pioneer. And don't forget, whatever turd bags etc fall from up top count as DROPS, so mind yourselves on those rounds.