Question from WCWS

[HollowMan]

My 12 YO daughter and I were watching the Hawaii vs North Dakota State game this weekend, and had a question regarding a play that happened in the game.

North Dakota State was batting, two out, runners on first and second. The ball was hit to the second baseman, and just as the ball got there the baserunner going from first to second collided with the second baseman. Runner goes flying, fielder goes flying, ball goes flying. As the runner is trying to crawl to second base, the shortstop picks up the ball and tags the runner out before she gets to the base. Prior to the tag, the runner who was on second base crossed home plate.

The Hawaii coach was ejected arguing over the interference call, but what my daughter and I did not understand was that the run was counted. Isn't tagging the runner the same as stepping on the bag, thus forcing the runner and negating the run?

Thanks in advance.