Steiner stays quiet and looks at you intently with a straight face for a while.
"Haven't the leaders of nations and corporations from around the globe repeated a thousand times in the last century that you do not negotiate with terrorists?"
He chuckled.
"I don't really like threats to my operation, Three Star. And don't get me wrong, but after being on top of Most Wanted lists all over the world for a couple of years, threats from the four of you don't really do all that much to me...
You could've maybe tried saying that I don't have much time to look for a new group and that not everyone's willing to take this kind of work. That would've carried more weight without the added risk of me deciding maybe it'd be easier to use you as fertilizer for this park."
He pauzes for a short moment -not nearly long enough for you to decide whether he's really angry at you or not- and then laughs.
"Sorry, I just don't get the chance to mess with people anymore, I'm probably getting rusty. Yeah, the offer is 50k for each of you in return for giving me a complete victory.
You don't get caught, don't leave clues that this was anyone other than TerraFirst!'s doing. The damage needs to be complete: I don't just want a lot of water, I want the water coming in with waves powerful enough to bring down their city."