Grayson Islands Auto-translated

You mentioned that he was in the first mage's cabin with the remains of other soldiers.

He checks the remaining doors.

Above the last door was written: "The First Mage."

Hiding behind the doorframe, Dobrota opens it and, after a slight pause, covers herself with her shield and draws her sword, peering inside.

-- If there's anyone there, I come in peace.
Hiding behind the doorframe, Dobrota opens it and, after a slight pause, covers himself with his shield and cloak, then peeks inside.

I suspect that Haven is already aware of what happened.

What could the captain possibly tell him? That the prisoners escaped? Okay. If we don't burn the ship behind us (by the way, we can, there's plenty of gunpowder), it will be obvious anyway, there's plenty of evidence. Even if we do burn it, they can still just assume the worst.
And we still don't know where we're headed.

Then that healer would have been killed too.

Added 14 minutes later
So, is the assistant's cabin also locked?

Back then, they would have killed that healer too.

Stavros starts breaking down the doors with an axe.