Held Ball = Injury

[Nevadaref]

I did a few of those type of games in DC.
The kids mostly stopped though. I was told that they can detect the vibration from the sound of the whistle somehow.

What you need to do when working with deaf players is be visible to them when making calls. You need to close on every whistle. If either you or your partner had quickly moved to be next to these two players while signaling for a held ball, it may have helped them stop battling for the ball.