[Sayo nods, before he speaks. No need to clarify what he is when they still need to get past this monster.]

If you can't aim, it's better if we try to sneak past it.

[If William can aim well, it can work as a distraction. But since he can't, Sayo doesn't want to get accidentally hit by fireballs.

He looks up at the Centipede. Hm... Distractions...]

You can try throwing some fireballs at it and we run while it's distracted.