Interference, Obstruction, or Incidental Contact?

[SamNVa]

I was PU for a 13yo AAU game this past weekend, when the batter hit a line drive straight back at the pitcher which caught him square in the chest just below the collar bone. As the boy dropped to his knees, my first instinct was to call time, as a matter of fact I had already started raising my hands. To my surprize, the pitcher reaches out, picks up the ball and throws the batter/runner out at first, then grabs his chest. I signalled the out while at the same time yelling time, as his coaches headed out to tend to him.

Just another example of not calling time to quickly.