Star strewn sky

2. The Plank of Carneades

There are two shipwrecked sailors, A and B, treading water in the middle

of the ocean. They both see a plank that can only support one of them

and both of them swim towards it. Sailor A gets to the plank first.

Sailor B, who is going to drown, pushes A off and away from the plank

and, thus, ultimately, causes A to drown. Sailor B gets on the plank and

is later saved by a rescue team.

Can Sailor B can be tried for murder?