Board Thread:General Discussion/@comment-17717422-20140412082304/@comment-7971816-20140412160541

I have been thinking that too. It's unlikely that there's only one group. One other thing to add to it : Throwing the spear happened from the same side of the river that Clarke and the others were on. This could lead to the fact that both groups of grounders are divided by the river.

It's hard to say up untill the point where we actually see the grounders.We only did once, but the person wore a mask so we don't know much about that. We only know that masks hide identities, and that's something you might want to do when you have several groups of grounders...