Answer:
This suggest that Grendel intends to not meet much resistance.
He isn't considered honorable due to these acts
Step-by-step explanation:
Snatching the men in their sleep and at night suggests that Grendel does not hope for much resistance from the men. Grendel comes when they're most vulnerable hoping to have an easy kill while the men would not be in the best position to fight back.
This is not a honorable way to attack an enemy.