he can fake injury. No legal action can ever prove he isn’t hurt
He still needs a physical. If he fakes the injury at the physical, Toronto voids the trade and it becomes San Antonio's problem. If he doesn't fake the injury at the physical but then suddenly is injured, that makes it easier to prove faking/fraud.
Assuming all these reports are actually true, this deal is not happening and SAS will have to start fining Leonard. Leonard is really off the rails here. I don't see the end game he wants. I don't think the Lakers are going to trade for him. Even if he is released (after his entire salary is absorbed by fines), the Lakers have no space to sign him.
Toronto would be a good place for him to be a star for a season. I guess Toronto could flip him to the Lakers, Leonard for Deng and Ingram, but that ends up being a pretty weak return for DeRozan, Jakob Poeltl and a protected 2019 first-round draft pick (Deng, Ingram, Green).