Insane SS kill

Yesterday, i was playing on rec server, Spy hunt

well, what happened is that someone got ss

[IMG]http://images.wiki*****m/combatarms/images/1/12/M14_SE_on_Waverider.png[/IMG] (this isn't me just pic to show)
you know how you can turn right and there's like a stairway down, well just at the start of the stairway, that's where the guy got ss.

i was on the roofs opposite, just facing the ss, i'd say around 1 metre or so away.

so he got ss, and i started spraying at head with g36e, i shot like 15 bullets in 6 seconds and i killed him O_o legit..
I don't even know how i did it....
1 shot to head is only like 5 hp isn't it?

more
sometimes
im guessing each hs with a g36 does like 6-7?
snipers do 20-60