I got a little bit lost at the bodies hanging from the lamp posts - I couldn't tell who had done it or why, or how it fit into the rest of what's going on. Reading over it more closely, it seems like the reader isn't supposed to know yet because Tomas doesn't; making that more clear might be as easy as adding in a line about how unexpected it is or how it doesn't make sense. As-is it's hard to track whether Tomas is surprised or was expecting something like this to happen for some reason.

Similarly, I felt like it could be more clear what's going on at the end - I love the setup of Tomas being stuck in an apartment with a large animal and having to use dado drugs as a weapon, but it felt like it ended kind of abruptly. I think the ending would feel more climactic if you showed more of what happens to the alligator when it gets poisoned - that moment is the grand finale of this individual chapter, so maybe go bigger with it, think of something really crazy to have happen.

As a contest entry, it's a little longer than I would think is optimal - I feel like a relatively small portion of the audience will invest the time it takes to read this. That's not a reflection on the piece itself, which is excellent, but I'm pointing it out as a matter of strategy; to whatever extent you want to put winning the contest first, it might be worth looking for cuts you can make to streamline further. I have no idea where they'd be, though.

Overall this looks really polished and is really strong all the way through - other than smoothing out those scene transitions, I can't think of anything that would improve it. I'd be happy to look over a revision if you make one, and either way, good luck in the contest!