Still near the battlefield? (presuming the battle is still going on. If it's not then this'll be easier)

If not, then it'll be difficult. If the battle isn't going on anymore then it'd be pretty easy to happen on the pyre. If the battle is going on Iyana might wonder where all that damned smoke is coming from and go check it out, cutting a swath of death and pain to get there (for the evulz).