Are you certain it was a sika and not a fallow?
I witnessed a couple of L2 stalks not far from there, and know there are a significant amount of fallow not far from there..
I've never know of sika in that area though. . . .Saying that they are almost certainly on the move Westwards and its not beyond the realms that it could have been. I saw two sika hinds West of Glespin last year.