Hey!
I thought I fixed this in the latest patch. However, one person said that disabling and enabling him fixed the issue. To do so, while he is in view, open the console with `. Then, select him (Make sure it says Lt. Mitchell at the top) then type Disable and enter enter, then Enable and hit enter. Then he should continue on like normal.
What version of the mod are you using?
Thanks,
Alexander J. Velicky
P.S. If you ever have an issue like this in the future, and I don't respond in the comments section of my mod, you can always send me a PM here or at the Nexus.