They had the element of surprise on their side, so that was something, and the plan had gone off without a hitch. Except the giant tentacle monster indiscriminately pulling friend and foe into its giant acid-roiling maw. Guards, allies, and civilians all succumbed to the wild tangent of its tentacles as they whipped over the stands in search of prey. It was taking full advantage of the chaos. Sure, there was going to be collateral damage, but they still couldn't exactly afford to lose any able-bodied allies or potential pilots. The creature grabbed a kid and Danny sprung into action. The spectators were horrible, they'd watched slaughter and reveled in it, but they were still civilians, and maybe some of them in some way were even innocents.
He raced along the lowest tier of the arena, pulling from the edge anyone near enough to the liquid horror and its wicked-limbed behemoth. He landed energy enhanced hits whenever it got too close, enraging it but gaining its attention. In a deserted section of the stands he grabbed it by one of its tentacles with his glowing fist, the energy protecting his skin from the dripping acid. The thing thrashed in his grip, even as he fought to hold onto it. Finally, it had enough and lifted it's might snapping jaws from its watery pit towards the meal so foolishly latched onto it at the acid's edge. Danny let go as the gaping mouth opened over him, and then he struck.
The monster let out a horrible shriek as an energy charged fist pummeled its tender eyes, it's horrible mouth reduced to broken teeth that choked it as they went down. Its enemy stepped away and began firing concussive chi blasts at it until, finally, it sank below the bubbling surface and did not rise again.