Coach writes on floor

[JugglingReferee]

If I do anything, it is:

I'm going to let team A shoot her 2nd FT.

As soon as team B gets control of the ball (2nd FT goes in, B rebound on the FT, or B possession somehow after A rebound on the FT) I have a whistle and talk to the game mgmt. Interrupt the game on B's possession.

I understand that it's not my jurisdiction, but I am in a position to prevent damage to a basketball floor. We all know how much it costs to fix/replace basketball flooring. I know nothing that tells me he isn't using a permanent or otherwise damaging marker. I might even suggest game mgmt to get a pen and sheets of paper for him.