Pony baseball

Not a balk, ejection if it continues.
And if the ump knew the fielder was in foul territory and it was really bugging him,there should have been no play "you in fair territory" would be the correct response.

Can you supply a rule reference?

Pony plays under OBR:

Definitions:

A BALK is an illegal act by "the pitcher" with a runner or runners on base, entitling all runners to advance one base.

Unless there is a squeeze play on, no one but the pitcher can cause a balk.

F5 the offender in the OP can not cause a balk.

4.03 When the ball is put in play at the start of, or during a game, all fielders other than the catcher shall be on fair territory.


When there is no penalty following a rule, then it is a "don't do that" enforcement by the umpire.
The only follow on for the umpire if the D refuses to comply is "ejection".

thank you