So we had a weird situation come up in a game recently. A rune golem was engaged with some spearmen that were in the forest. The spearmen during their turn shifted. Looking through the rules it says that you can shift if engaged in terrain and to treat it as a disengage when you exit (81.8). The rules for disengaging say that you have to shift away from the contacted edge, but with terrain we were unsure how this worked. So in this example the spearmen player wanted to shift out and get position on the rune golem because he argued there isn't really a contacted edge while in terrain since you always treat it as fronts touching. Was this allowed, it's a bit unintuitive to me that you can disengage closer to an enemy but I didn't see anything super clear about contacted edge while in terrain. Or should you just have to shift on the direct opposite side that the rune golems.
I made an incredible ms paint drawing to show what happened with blue being the rune golem, black box the terrain, filled-green as the spearman and the blank box where they wanted to shift.
Thanks