Did he truly think it was going to be that easy? It is true that Arrancar possess human features, but it would seem that they lacked human wisdom. Perhaps in the vacant desert of Hueco Mundo one might easily stroll into the territory of another, without fear of reprimand. However, this is not some abandoned cave or empty forest, this is the residence of one of the greatest Shinigami to ever live. It may be that infiltrating the barrier was difficult enough for Abraam, that he thought it would be the only defense. Little did the Arrancar know that the precautions taken to protect this place, with layers upon layers of contingencies, would render the little shop as difficult to infiltrate as the Seireitei itself.
Upon entering the barrier, Abraam would see that the lot of land which the shop sat upon had been completely overgrown with grass and weeds, with the shop itself looking utterly abandoned. Regardless, Abraam’s barrier erects itself around the unkempt plot, and seems to protect him from the outside world as he begins to stroll to the front door. However, the moment that Abraam's foot lays upon the grass of the yard, a shearing pain would be sent up his body. He would find that each blade of grass had sharpened itself in response to his presence, standing stiffly on end, a thousand little blades. While it is true that Abraam was staying alert for any exterior threats, it would appear that this caution did not apply to the ground that he tread upon, as he intended to walk with reckless abandon right up to the front door. It is also true that the Arrancar is suppressing his presence, and yet not completely. This means that it is unclear if the literal blades of grass activated upon the minute traces of his reiatsu, or upon the physical contact of his footfall. Thus, even if Abraam suddenly decided to inspect the ground, he would find nothing amiss until after his foot landed.
Regardless, the Arrancar’s foot would be pierced. With this came a tingling sensation, that would fill his entire body, not unlike the feeling of electrocution. It is likely that upon feeling the pain of his foot being pierced, Abraam’s instinct would be to recoil from the pain’s source. However, Abraam would find that his body cannot respond to his basic instincts, in fact, it cannot move at all. The sensation he is feeling is that of paralysis. Rendered nothing but a garden decoration, it is also likely that the Arrancar would attempt to free himself using a spiritual technique of some kind, perhaps a unique ability granted by his aspect of death. However, just as with his body, Abraam’s spirit was also restrained. The tingling sensation did not merely restrict his physical movements, but the flow of his spiritual energy. His carelessness had rendered him nothing but a sitting duck, standing frozen with his hands in his pockets. The barrier he erected would still protect him from the threats outside, but what of the ones inside?
Boom.
The front sliding doors explode off their hinges, sending sharpened fragments flying directly at Abraam with tremendous force. The dust kicked up by the door’s destruction obscurs the entryway, and trails into the sky. Abraam, paralyzed, would not be able to look up above him, and so would not see the threat that now descends upon him. Instead, he would be met with a torrent of downward force, its source still unseen. An instantaneous blow would connect with the top of the Arrancar’s head, striking with such power that it would easily ripple through him, shattering every bone along the way, as his body collapses in on itself, until finally the ground beneath him would explode. The grass which binds the Arrancar would turn into a crater ten feet in diameter, dirt and chunks of earth flying into the air, splattering against the Arrancar and the barrier behind him.
Should the Arrancar survive such an unexpected, instantaneous, and devastating assault, his senses would permit him now to follow the movement of the assailant, after the impact of the initial blow. What he would sense is that of a large pool of reiryoku, however, where other souls were given a flow of reiryoku, this soul was completely composed of it. Some sort of creature had descended from the air, and now kicks off of a Reishi platform, shattering it upon impact. This thing was clearly not a Hollow, nor was it a Human or Shinigami. Indeed, throughout Abraam’s entire existence, he likely never would have encountered a monster such as this. A monster which now lands before the entryway twenty feet ahead of the Arrancar. Ten feet tall, it stands prepared to deliver another strike, and perhaps most concerning of all, it opens its mouth to address Abraam directly.
“We’re closed, punk.”