Suggested 2v2 change: mobi-bombshell nerf

[GreatGonzales]

I actually didn't know that the mobi couldn't warp a rooted bramble. So, I get the argument to do the same for the shell, to make things consistent. But it's actually not quite analogous, because the bramble does not spend a wit to root, and also there are other implications of unrooting the bramble, namely that all the thorns disappear.

While it's true that mobi/shell is almost definitely the best team combination...I dunno, it makes team games pretty exciting. Agree, though, that this change would bring more diverse strategies to 2v2.