Goruc cannot suck units from opposite lane, It brings them closer uptil end but cannot eat them.
I think it is normal, the latter one would be op, if a group of enemy unit pack at the chocke point and with just one use of goruc ability they would be wiped out^^.
As Alumbri already mentioned, sucking units from across path borders would potentially be too strong, so the behavior is intentional. Also, we don’t want Goruc to eat too much, he might explode… again
So Thats why there is a bandage