Ulquiorra fixed his attention on the waving red tendril. It had to be aware of his presence, and if it had sufficient mind, would likely recognise him from earlier. If it lacked sufficient mind, it may still recognise him; the Hollow was distinctive.

If he approached it may attempt an ambush attack, and then Ulquiorra, positioned between Gin and the Weapon, would be in the way. He did not trust Gin. Poking the tendril was out of the question.

There was more than one way to poke at it, however.

Ulquiorra stood still, regarding the tendril for a moment, and then with drew his hand from his pocket. With a quick movement of his hand, and a sound like a gunshot, he fired a bala at the thing.