Help on "tag"

[DTQ_Blue]

Girl in rundown between 2nd and 3rd. F6 chases her back to 2B, F6 reaches out and tags runner as runner begins to dive back to 2B. Runner is now on the ground and F6s momentum causes her to trip over the down runner. As F6 hits the ground, the ball comes out of her glove. The ball was securely in her possession until that point.

Is the tag rule like the catch rule where there has to be voluntary release, i.e., no out on this play, or is this an out if secure possession is retained through the act of applying the tag and releasing the glove from the runners body?