Hows he going to "Deal with the consequences", if he insta-dies with 1 HP.
the autosave should allow him to get away. He stated he exited the store, so ouside there is only one guard with a plasmarifle, which he should be able to avoid.
Remember that you can move a few seconds BEFORE the loading screen finishes, although you wont see anything. load autosave, strafe right and back during loadscreen, get around corner, use ANYTHING that heals (buffout in hc mode) and bunnyjump for your life.
or he could throw up vats and shoot Simons weapon out of his hand.
I dont think the autosave saves you a plasmaball 2cm in front of your face.
Im gonna try this now. at the van graffs.
EDIT: Set my hp to 1, entered store, shot one guard. all pissed.
exit store. autosave.
load autosave: in 5 tries i always got around the corner. it took simon about 1.5 seconds to start firing and about 4 shots to hit (=kill) me. enough time to use items, lower difficulty (well, a little useless at 1 hp) or try vats; i also managed to reach the door in the building on the opposite (though not always.). on pc its definitely doable. on console it might be impossible (dont know about controls and speed and reaction times).
Try it for yourself. The autosave gives you about 1.5 seconds free action.