Murderous strike Ra-Den on 10h

[Lightwolfer]

WoW Freakz link: https://www.wow-freakz.com/spells.php?spell=138333&&name=murderous-strike
Bug description: Murderous Strike is used on tanks on 10h. This shouldn't be the case and is a 25h unique spell according to all information sites.
Proof:
My combat log and cd on Freakz: http://imgur.com/a/jzsNq
Fight script : http://wow.gamepedia.com/Ra-den_(tactics) :
"Murderous Strike — An unerringly accurate strike that turns the life force of the target against them, inflicting Shadow damage every 2 sec for 10 sec. The damage dealt is equal to the health of the target at the time of the attack. This damage ignores most damage-reducing effects. Instant. Cast in 25-player Heroic mode only"

Would be really nice if it could be fixed. This spell is a combat ress number check for a 25man sized groups, and thus , a real problem for 10man groups.
Thanks