First things first...

You ignore Robin for now, and kick Beastboy in his gut. He doubles over and you grab him around the head in a reverse headlock. You lift him up and go to throw him, but he transforms into a tiny bird with rapidly flapping wings (Hummingbird). He flies up, and you chase after. He zooms around in hard banking turns and a few loops.
*ZAP ZAP* You shoot lazer eye beams at him, and he has to zig-zag to avoid them. He dives back down to the ground, and you dive after. He transforms back to his human form, and waits for you. Then *SHWIP* he transforms into a gigantic lizard, with a HUGE head and little arms (T-Rex)!!

"GRRAAAWR!!" he roars with his giant jaws, and you screech to a halt. He stomps after you as Robin carries Cyborg towards the apartment.
You unload a barrage of starbolts on Beastboy. *ZING ZING BOOM BOOM ZING BOOM ZING* the bolts hit their mark and explode, creating a large smoke cloud. A breeze blows the smoke away, and reveals Beastboy, back to his humanoid form, dazed and stumbling. You fly in and *KABAM* Flying Boot Kick to the head! Beastboy flies back several yards, and skids to a halt in the dirt.

You look ahead to see that Robin and Cyborg have made it to the front door of the apartment!

Since they're headed up, you head up ahead of them. But first, to delay them. You fly at them, and aim for Robin. *WAH-BAM* You kick Robin in the back of the head. Robin goes flying into the middle of the lobby. Before Cyborg can react, you fly up to your room's window, and bust through it.

"Whoa, what's going on?" Blackfire demands. Raven is still awake, but completely bound in the torn remains of her clothing. Starfire is still asleep, and bound by extra bedsheets.

"Robin and Cyborg are in the lobby. Beastboy is knocked out on the ground out there. They'll be up here in a few minutes."

"Alright, I'll help, since these two shouldn't be going anywhere on there own."

You and Blackfire fly down the flights of stairs, and hear the two Titans climbing up. You keep flying down, and meet Robin and Cyborg a third of the way from the bottom.