Chieftain Cherokee had clearly identified the weakness being that strange, malevolent looking massive gateway; realizing that the reinforcements it could supply was limited, and every spatial transportation required a definite interval. This was because the Blackthorn Overmind had purposefully suppressed the effects when incubating out the Nydus Worm, less the Blade Empress would notice irregular ripples in space!
Within Cherokee’s schemes, he sacrificed the life of a legendary beast without hesitation, and eradicated an entire 7-8 stacks of the opponent’s forces! Thus at present, there was nothing to worry about as the opponent’s forces had just suffered immense casualties. Moreover, when his warriors successfully speared to the front of the Nydus Worm, it could at most regurgitate 2 more waves of limited reinforcements.