Sheperd pileup in meltdown

in meltdown our sheperd minions kept getting stuck on an invisible wall as the round the bend near the grinder nearest our base. The little minions could make it past but the sheperds were stuck until the enemy finally got through and killed 4 or 5 of them in one go.

http://images.akamai.steamusercontent.com/ugc/268339305917065784/1B843E89EB4B3AE45D75753864090CAA54A43A80/