Alex was creating mayhem right before the entrance, constantly staying on the move using ground and air alike but not leaving the Skaven a clear path of entry, and while his efforts only slowed them by a little, it was still of great help to the defenders.
It took mere seconds for the Skaven to begin entering a state of rage as the mana of their fallen brethren permeated through the area.
Whereas before, the weak ones were avoiding him like a plague, under the influence of rage, began to throw themselves at him, no longer caring for their own life in the slightest.
Alex was faring well even when he dealt with hundreds if not thousands of Skaven, as anyone who got near him and did not get sliced by his blade or had their bodies twisted by his chaos wings received a serving of chaos, turning into a ticking bomb.