What to do about deepstriking daemon flamers?

[Odds.043]

The Sicarians are actually very useful, as they can get into the opponents backlines very fast. I wouldn't charge them into flamers with them having only a 4+ save and all, but they will destroy horrors, beasts of nurgle and a lot of other units. So yeah, shoot flamers, charge everything else :)

I musn't have been too clear... I deep struck celestine and outflanked the infiltrators just behind a unit of horrors and her 2 heralds that I wanted to charge. It's just by my charge phase turn 3 I had already lost... I was confident they would make it to combat though if I had continued.