Well, possibly there was. But he couldn't think of one. Given that he obviously really wanted to survive, he's super-clever, and he knew the situation better than any of us, there's no way any of us are going to think of it either.
Maybe there's some big plot hole that Russell T. Davies accidentally left in there, but even in that case, I don't think it would really count. RTD claims he came up with most of the details of this scene the moment he cast David Tennant, and very clearly he always intended that there was no other choice besides the Doctor dying or his companion dying (just like the Fifth Doctor's death, which both RTD and Tennant remembered fondly).Ummmm... no.