You're silent. I'm silent. [RK900/Gavin Reed]

Can androids regret?

The rays of the setting sun lay on the asphalt, as if illuminating the right path, which, as it should, has its end somewhere in the distance. No one knew why, at this very moment, when time seemed to stand still, the cheerful singing of birds could be heard through the ringing oppressive silence.
Voices. Voices are everywhere. Screams. High-pitched screams. And the blows, after which on the asphalt, illuminated by the setting sun, there were bloody traces of those who had strayed from the right path. All this was mixed into one big lump that was ready to crush at any awkward movement.
***
Standing in a dark room, hearing only the beating of his mechanical heart, distilling thirium throughout his body, Richard looked at the bed, at the place where a small depression had formed.
The diode was burning red, and its light reflected from the mirrors on the closet and illuminated a small pile of clothes on the floor, the kind that people usually walked around the house in and which had been abruptly abandoned during the morning rush.
Why did it happen like this? Was there a chance to change everything? Where exactly did he go wrong?
The flow of thoughts was interrupted by a call that, like the previous 100, was rejected. They were different numbers, different people, but they had the same intention.
Can androids regret?  That was the question that was running through Richard's mind. He was not a deviant, but regret is clearly not what was prescribed for androids in programs at the time of their creation. Then why? What kind of feeling is that? It was as if the chance had been missed, as if the understanding that time could not be turned back was pressing from all sides, causing temporary failures in the system.
Once again, the call brought him back to reality - to the room belonging to Gavin Reed, who had been in the hospital for a week after another seemingly routine assignment.
Richard couldn't take the call. Not now. It seemed that if he did, the system would fail again, which would put him out of action forever.
When a shot was fired somewhere in the distance, Richard did not immediately understand what was going on, and therefore did not hurry to the place where the blood was spilled. When Gavin was taken to the hospital, he wasn't there either. When Gavin was operated on and finally transferred to a regular room, he wasn't there either. Richard couldn't even imagine how he would look into his eyes, hear the husky voice that seemed so close but so far away, see the new scars that reminded him of the evening he didn't have time for..