Batman/Maria/Superman
She was actually a little surprised - and therefore suspicious - when he agreed to talk about the two toxins in question and even offered more. She could count on one hand the number of times he'd done something for SHIELD with any kind of grace, much less volunteered information without an edge to his voice.
Oh, wait, there is was, at least a little, as he pointed out that he'd told her how this was going to go. Maria started to bristle at his words, and would have snapped back if he wasn't exactly right about what had happened. "Can't even reach over and shake him for being too damn noble and ethical," she grumbled. He was wrong, but then, he wasn't one of her soldiers who had known that it was a possibility coming into it; he was absolutely committed to not-killing, period. Such extreme dedication to pacifism always confused her at best.
Led over to the bank of computers, she pulled out the recorder and held it towards him as she watched the videos popping up on the screens. "Can you send these files to SHIELD for inclusion in this report?" she asked quietly. Other than that, she knew enough to shut up and let the recorder catch the words; she was no expert in chemistry, to know what various hormones did on the brain. She'd record it, send it to the geeks, and know enough right now that it wrecked havoc on the brain, causing confusion and terrifying hallucinations. "Of those reactions to the Fear Gas," she asked as she watched the animated breakdown and the video of Batman succumbing as if she actually knew what the pieces of the molecule was, "what is the rate of fatality?
"Given that movement is possible," she said with a nod to the videos of the rioting and of his staggering, "and given the hallucinations, are they aware of their other surroundings when they react?" It appeared not, but she wanted to hear it.
Then he moved on to the second one, and again, she fell silent, because there was nothing more pointless than piping up about the chemistry when she had barely scrapped through high school Chemistry because setting things on fire was a big part of the course curriculum. This wasn't just fear; this was intended to kill, and in a slow, painful manner with a ladle of humiliation. She distilled the matter down into the essential elements: "Death or insanity after exposure possible even with the antidote.
"Hypothesis on the combination of the two," she said. "Hallucinations and physical reaction of fear, followed by loss of control of basic reactions. Combined with pain-" at the very least, but maybe he'd jump in with more detail - "from the Kryptonite, followed shortly by death.
"The threat of attack or his perception of an intended threat would have been more than enough to clear him of wrong-doing," she said quietly as she keyed off the recorder. "This was an attack with lethal intent and force." Whatever unease felt over a good and noble superhero killing someone was, for her, shrugged aside in light of that; he'd been attacked and returned fire, as she'd assumed. Now she just knew the exact degree of the attack, how much it took to hurt him. All good things to know.