In my dreams, we shipwrecked and washed up on an island. But we weren't alone, there were men there, led by a madman. By the end of it, to save my friends and the woman I loved my best friend in particular, I'd killed four-hundred and twenty three men. Most especially the bastard who nearly burned her at the stake.
I would do anything to save them and circumstances can make us do things that we'd otherwise find terrible.
I don't know your circumstances, but if Sam was poisoned, I'd go to any length to get the antidote and deal with the consequences later.