"The only way we're getting out of this is if we work together." Torin's also rushing to get to the District 2 life boat, albeit slower than the Batter. He's not moving as fast as he did in his prime, and he's already starting off with a handicap...but at least being elbowed in his bad arm doesn't bother him much. And making an alliance with one of "his" Tributes in this case makes sense.