How much is too much

when it was time to go outside with the older age students i got involved in a game of kickball. The first thing that i noticed was that the kids were pitching the ball like garbage. Kids couldnt kick it and they were picking the rolls up and throwing them back to the pitcher as if they were a called ball in a baseball game. I decided that i would take over the duty of pitching in the game. I pitched for both teams and wasnt going to try and make any outs at firs. After letting a short fly ball fall to the ground in front of me the students were pretty upset with me so i decided to catch a few kicks and try to make an equal amount of outs for both teams. The competition between the two teams was fierce. The last out of the game so not a good one and one that made me question what was appropriate for me and what wasnt. As i made the out the boy triped over the ball and fell. I felt awful and for a minute thought that this going to be a big deal and that i bit off more than i could chew. Accidents happen when playing sports and games but it still felt different being so much larger than those students. What happened was the ball was kicked short and rolling towards the third base line. A runner was on second and heading to third. As i fielded the ball the runner was litteraly 4 or 5 feet away from me. I gently passed the ball into the runner. After the ball hit the student it bounced on the pavement and he tripped on the ball and fell hard onto the black top. I felt so bad and i didnt really know what to do. Something so routine and simple became serious.