Generally speaking, you will wish to keep your blood inside of your corporeal form, yes. However, it is a useful commodity at times in measured quantities should you need assistance from some of the locals.

[Thankfully? He wasn't in the business of doing such a thing as hurting himself that badly. Usually. Probably. Best not to think about it. He motioned towards some of the Trenchies, handing out backpacks.]

They will have your personal effects, those which washed ashore. For some reason, they are skilled at identifying proper owners.