Coach Riding Partner?

[ctblu40]

A quick question...

I worked a 16-18 BR game last night with a relatively new partner. He's in his second year of umpiring.

He had quite a few "bangers" on the bases, close enough that they could've gone either way in my opinion, and the coaches were riding him mercilessly. A couple of times with really close plays at 1B, the one coach went out on him to argue with questions like, "Did my F3 come off the bag? Why is the runner safe?"

My partner was obviously starting to get thrown off his game.

My question is, at what point do I (or should I at all) step in and put a stop to the nonsence? It reached the point of holding up the game for no reason. Toward the end I thought they were just arguing with him because he was letting them.

I'd like your opinions on this issue.