Batman: Gotham Knights

You drop a few gas grenades down onto the group. The gas knocks out any human in the area, but it also kills most plantlife. Though the Gotham Botanical Gardens may be a bit angered, you're sure Bruce Wayne can help them out with a nice charity check later on.

You drop the grenades and the goons pass out quickly. Ivy seems immune to the gas, but as you drop down, she can't raise any plants to help her, seeing as they've all been dispatched. You throw on your gas mask and punch out Ivy. You bring her outside just as the GCPD shows up, tipped off by someone.

"Good work, Batman." Commisioner Gordon comments, "Ivy's going back to Arkham where she belongs."

"And Croc?" you ask.

"We never found him." Gordon sighs, "And he apparantly stole the Mach Diamond as well. Another day, I guess."

Gordon attempts to say something else, but you've already left.

Back at the Batcave, you sit in the chair in front of the large Batcomputer, and remove your cowl. It's been a long night. Croc is still on the loose and he's stolen the Mach Diamond, and Ivy was apparantly working with him... though they were both working for someone else.

You think about calling it a night before an all-points-bulletin suddenly rings out through the Police Radio Channel. It seems that Croc's been spotted, and he isn't alone. Two-Face is also with him.

Harvey Dent's been on the loose for a few months now, laying low. The bulletin places them at the Gotham National Treasury, where police have them surrounded. However, they also have a hostage, namely the President of Gotham's Finance Commision.

Looks like you're going to have to take matters into your own hands. Croc needs to be taken in, and so does a hazard like Two-Face. You go down to the Treasury building and sneak in the back, dealing with a few easily dispatched thugs. You finally find your prey, and they seem to be arguing.

What do you do?