Game Mechanics: Double Attack skill

[Alienorg]

I was targeting a corpse of another player and hit attack by mistake and my double attack skill started to go up.
i had just got the skill and it was at like lvl 15 and my max is 85 took about 15 min's to get it to max.I was in melee range of the corpse i didn't check if it worked from out of range.
I didn't do any swing animations and i took off my daggers to see if i could get hand to hand up and that didn't work. my piercing was already at max.
i couldn't pickpocket or beg the corpse or backstab it.
So i think it is just the double attack skill that is messed up.
This was on my Rogue