There is no 100% safety for a big short....but if you see how CSTI is continously driving down the ask....something smelling and I believe it is still shorting.
The question will be what is the Event which forces this entity to cover the Position.
If this shorter is really there(what I believe)and if he has to cover then it will be huge and fast.
Still the question remains why this is still ongoing....I believe the loss for covering is to big to do so, means for the shorter "all or nothing".