If there's something more useless than Dr. Rodney McKay in a firefight and cleanup aftermath, it hasn't yet been discovered. As a result, he stood there, staring at the mess... the shouts, the screams, the blood.

'Acid. Baking soda. Base. High school chemistry.' At least McKay could help with that, though he was trying to ignore all the blood, the pain... and trying not to pass out with the emotion. Forget the psychics, he could feel it all; in a blaze of empathy with those around him, he wondered quickly what they must be going through. That, however, taken care of, he followed Locke now, a useless body in the aftermath of the fray.

He headed towards where the Doctor was now with a lack of being told to do aught else, following his instruction as per the baking soda. Take care of some of this... acid? Well, that's a turn off...