Scorch (Ignis Spell) - 62548

[zergtmn]

I have a trouble with spell that's used in Ignis the Furnace Master encounter. When Ignis uses spell http://www.wowhead.com/?spell=62546 the ground where the spell hit should become scorched (actually http://www.wowhead.com/?spell=62548), and deal AoE damage and apply http://www.wowhead.com/?spell=65667 buff on Iron Constructs (http://www.wowhead.com/?npc=33121).

So, I summon an invisible creature and apply http://www.wowhead.com/?spell=62548 to it.

First effect is working properly, but the second triggered spell applies Heat buff to players and not to Iron Constructs.

How can fix it?

Of couse, I can emulate work of this spell manually but... maybe there is a better solution?

P.S. Sorry for my English...