Fuck Tybalt. Piece of shit. I'm not into drama so i don't have great knowledge but this as to be one of the worst deusex machina for start a drama ever written.
It's almost clear that Jill doesn't really believe Tybalt nor feel threatened. She studies together, she plays D&G together, she goes into DIK's mansion and also at end of the picnic she seems pretty easily reassured after MC speech.
Still lawsuit could put MC in a pretty bad spot. Even if "arsoning" or whatever doesn't hold up in court there is still trespassing and property damage. Also money/knowledge difference is there. Also he could face punishment form the board like suspension or worse expulsion. To "win" he needs to bring down Tybalt's dad with some hard evidence or somehow level out the status difference, like his mother's family always wanted a part of B&R for reasons but couldn't put is feet in and now they can finally use this nephew for something.
Jill