No change to intro text or "Ask him why" result while etheric.
Mag reports beating him up a bunch at some point to no result.
No new conversation option with the figure in flames if you've attacked the punk after he's started supporting them.
No giant explosion for using a fire tech (frag grenade) against this guy after he's become a bomber.
Only attacked the guy a few times (once before he was fully supplied, twice afterwards) but all the above lack of clues makes me uninterested in trying more.
EDIT 22 Jan 2015:
No change if you have both punk outfit and Midgard security disguise on.
Lash out data points:
6 items, 12 items, 18 items, 19 items: normal punk
20 items: bomber