Is screen sharing boxing?

[Baler]

it's boxing when you're playing two characters on the same server. No matter the method.
You can play 1 char on blue and 1 char on red. But not 2 on blue or 2 on red.
1 person per 1 character logged into a p99 server.

The question i think you're asking,. is it okay to watch someone else play their own single character. Yeah otherwise watching streams on twitch while playing would be ban-able.
Just make sure you have zero input capabilities on their game, otherwise it's ban-able.