"If you ask the Redguard man-at-arms to 'wait here until I return', you can talk with him about 'rumors'. (All the other men-at-arms immediately end the conversation instead.)"
"The Men-at-Arms possesses the standard knight spells list containing one major Illusion spell, despite not having Illusion as a major skill due to their Marauder class. As a result of this and the NPC skill leveling mechanism, they will only ever be able to cast novice Illusion spells. However, the Illusion spells in their list are of at least apprentice level, meaning they will never be able to cast any."
From
https://en.uesp.net/wiki/Oblivion:Battlehorn_Castle_Men-At-Arms