When releasing so many frenzy bombs Ezekiel had to be very careful so he would not harm his allies, but he was having far to much fun to focus on such a concern right now.
Diana attacked quickly and he obviously had to be very careful to not actually take a full strike from her but he suspected the intelligence of the boss was still not the same as that of a person because the boss did not really do many tricky moves.
She would stab and slash at him and although it was an incredible speed he could still identify what would happen.
The problem with fighting the boss in this way was that he had to fully dedicate himself to countering her own strikes, although he could block her attacks they were not perfect counters as often as he would have wished.
His wings were getting injured and he had to block by hand more often than not, because of this he had cuts across his arms and hands that made the pain distract him.