Sarcastically

"I'm the local Fire Marshall doing a surprise inspection. And I've got to say you have several serious safety violations in this facility. You're going to be facing some pretty major fines unless you can get things up to code."

"Hahaha oh you heroes. I do enjoy some witty banter. But I am a busy man and you have interrupted me during a particularly busy time. So let's cut to the chase. I assume you're with Supergirl." -Ah crap, they know about her too- "We are going to be testing my latest creation on her momentarily. We were going to use it on you as well, but given how quickly you recovered from the knock out dart, I fear we'd just be wasting product on you."

"I'd leave her alone if I were you. Trapping me is one thing, but if you go after Supergirl, you're in for a world of hurt."

"Perhaps, but it's testing day and if I'm right, I'll have plenty of time to make my escape. Now if you'll direct your attention to the viewing screen, we can begin."

You've been trying to loosen the knots that are holding you to the chair. Clearly they didn't think you'd be awake for a while as you aren't tied down very securely. You think you can get free with one big tug. The monitor shows Supergirl approaching a large chamber where an ambush awaits. Now's the time for you to act.