hello, my american toad just jumped out of some artificial plants and now one of his back legs is locked up, the herp vet is hours away, i dont know what to do, hes very twitchy and i think hes in pain, hes a male, and is about 4 years old

i wont let him suffer long, i have tried moving the leg, i can get him to pull it in, then then he pushes it back out, and he drags it around with one leg hanging out, this happened about 15 minutes ago, i just check and now both legs are locked up, and there is white fluild coming from his legs, also his underside is very red ,