Get ammonia taken care of where he is, yes you can do multiple small water changes daily, just make sure sure you do not do huge changes at once. Has he eaten, if he eats I wouldn't worry so fast, if not, that's another story. Lions can be difficult to feed initially, but you do need to get him to eat'
That bolt forward could be flukes, normally you will have time to address this; in an advanced state you would see cloudy eyes and he would probably be at the surface maybe even taking air from the surface. this would be more dire. His breathing could also point to this, and a treatment of prazi pro would be prescribed. If he doesn't eat then transferring to a tank where you can treat with general cure would be the best course of action. Make sure to balance the sg between the tanks.
Lions also shed their outer layer, many times when going in a new tank due to chemistry changes, and even stress. This is also accompanied by that bolting movement. This can be of no concern or could be him fighting a bacterial/parasitic attack. The shedding process is most times non threatening.