After several minutes of pacing around pointlessly in the enclosure, you sigh and (out of habitat) reach into the pocket you longer have to bring out the cell phone you know longer own. If you'd known you were going to have to wait this long out here to start changing, you'd have saved your little "going away party" (heh, heh) for out here, just so you'd have something to do. No claws, no fur, no new or improved senses, no nothing, as far as you can tell. You're just standing around, still on too legs, waiting for nothing. You've been out here by yourself for what might as well have been hours, with nothing to focus on but your own boredom, the hot sunlight beating down on your bare skin, and that worsening heaviness in your spine.
Wait a second, a heaviness in your spine? Is that just a symptom of your fatigue, or ...?
Looking down, your eyes widen at the tawny muscular tail and brown-haired tassel hanging behind the gap between your legs. A sudden flash of insight makes it feel less like dead weight and more like something that can hold itself up if you want it to. Tensing it experimentally in a couple of distinct ways, you see it swing left and right under its own power, feel it brush against your legs as it does so, and watch it return to its previous position when you're finished. You pick it up from between your legs and hold it in front of you, disoriented by the sensation at first but then pleased by it.
"If you're going to be a beast, might as well be the king of beasts!" you think, thrilled that you decided to turn into a lion. You let go of your tail so you can move it around some more and focus on the funny feeling in your hands. Flexing your fingers in and out eventually manages to bring out a set of sharp claws that you can easily tuck away back where they came from. You marvel at the fact that you don't have your original fingernails anymore. A breeze through your hair makes you realize how much more hair you can feel up there. Patting around on your head and neck, you discover a forest of thick hair hanging out and even starting to grow on your shoulders. Even your chest hair looking thinner and browner as your lion's main starts to take form. "Boo ya!" you manage to shout, before immediately grunting in discomfort as a pressure takes hold of your balls. They're growing fur, but what really feels weird is that they're being pulled back behind you until they've basically right against your tail. That's going to take some getting used to.
You see a few professional-looking people in SRP uniforms pulling around in an animal transport van. They step out carrying tranquilizer guns and talking to each other under they're breath. One of them gets out the key, presumably to open the enclosure after you're done changing. You supposed they don't want to take any chances with a large apex predator, even if it did used to be a human like they are. You ignore them for now and wait for your face to change and your paws to finish forming.