True... but for purposes of clarity, Immolation is the point of reference since it is already in the game and is pretty well known.
Since immolate states "Sacrifice a creature" and only allows the owner's creatures as targets, it stands to reason that this would hold elsewhere unless stated otherwise.
Thus, if a "sacrifice" effect could apply to the enemy, it would have to explicitly state that on the card. Otherwise owner only targeting would be assumed.
Mainly I suggested this reward so there would be more room to fully describe the effect on the card. That gave a little more room to describe other facets that needed a little more explanation.