Grimbold has come up with a plan to deal with two problems at once: a treacherous warrior and an imprisoned Ranger. The man he believes to be a lackey of Isengard volunteered to guard the Ranger and might have his fondness for strong drink exploited.
'You say that you need some ale for a friend of yours? Ha! But you did us a great favour, so I am more than happy to indulge you.
'Here you go. You and your 'friend' can drink to your health.'
Daervunn the Ranger is detained at the Ford of Isen.
When the current guard leaves, put the ale someplace where Arbald is likely to stumble upon it.
Daervunn the Ranger is detained at the Ford of Isen.
You should wait until Arbald drinks himself into a stupour, then cut the imprisoned Ranger loose, but be careful not to let the guard spot you.