""""Only person capable of moving her like that is Moe."""
Or a killer with adrenalin pumping in 12th gear!
http://www.add-becalmd.com/8928/science.shtml
The adrenaline release causes the heart to beat both faster and harder and causes red blood cell reserves to be placed in the blood stream. It causes energy sources, nutrients, and oxygen to be diverted for use by the muscles. This deprives functional organs such as the liver, the digestive tract, etc., from their needed resources. This results in the person being able to make an almost super human (though perhaps illogical) physical response to the threat!
Makes sense then if HKS sent everyone away, delivered the deadly dose and as you say the adrenaline would have been flowing... and time would have been of the essence.