That's a good one also, but if you understand that a line drive could be hit right to an infielder, who catches it and tags out a runner nearby, then it's really only the last out that would be the difficult one. If one or both of the runners was taking off with the pitch (to steal or hit and run), then it could be a long distance back to the base. And a fielder near second base just might have that triple play possibility. Also, if the last runner is caught in a run down and the fielders are throwing the ball back and forth to close that net tighter, then one of them will tag out the runner. Sometimes, three infielders are involved in those and each has the ball in hand at some point. So the ball could be in the hands of the same fielder who caught the ball and tagged out the first runner with an opportunity to register that final out. Likely? Not at all. Possible? Yes.