Xeshanth comes to the calm realization that the group is in for an actual battle. Not wanting to be overheard, he casts a brief incantation:

"Secret est mon langage
Seul le vent du murmure
Portera ce message
Discrète est sa nature..."

When he whispers towards Onwym, no one else can hear the words. "Don't stay there, boy. They'll be coming up the stairs, just behind you. Come next to me, and get ready."

The youngster comes to stand next to his tutor, and points an arrow towards the stairs leading to the hold below.

Spoiler
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Xeshanth casts Message.
Onwym moves to P14 and readies to fire at any armed person emerging from the stairs in V12/13.
(1d20+1)[9] damage (1d6)[4], cc (1d20+1)[21] cd (1d6)[6].