Medics remove a man from an apartment building at 408 E. 65th St. after an officer fired shots at a man wielding a knife.  A woman held at knifepoint by her deranged son was accidentally shot in the butt by police during a chaotic clash in the hallway of an upper East Side building, sources said.  A frantic woman called police about 2 p.m. on Monday, telling cops her brother, Edgar Soto Jr., was threatening their mother with a steak knife. Cops arrived to find Soto, 22, holding a 4-inch blade to the throat of Flora Soto, 49. Two officers and a sergeant arrived at the building on E. 65th St. and ordered the young man to drop the weapon. Soto, who suffers from mental health issues, refused to drop the knife, police said. The sergeant zapped him with a stun gun, but that didn’t stop him.  Soto, who was off his meds, charged at cops in the narrow sixth-floor hallway and simultaneously let his mother go. One cop fired three times and another fired twice — each from about 10 feet away. Police said the mom was shot in the buttocks, but the bullet wound may have been the result of a ricochet.  The suspect, described by neighbors as 6-feet-3 and muscular, was shot in the abdomen, the side and the scrotum. He and his mother were in stable condition at New York-Presbyterian Medical Center.  None of the officers involved was injured.  Neighbors described the suspect as a hulking, troubled young man who often skips his medication. Police were called to the apartment to quash a domestic squabble six weeks ago when he was off his meds.  One friend said Soto hasn’t been the same since getting injured in an accident several years ago.  “He used to say he just wants to be normal,” said the friend, who asked not to be identified.  The friend also said the man’s relatives, including his namesake father, have dedicated their lives to caring for Soto, whose dad is a city sanitation worker.  “He’d be a genius if he didn’t have this problem,” the friend said.  “He writes music. He writes poetry. He draws. Edgar is a real artist.”  Others recalled getting spooked when they’d see Soto walk his sister’s dog around the block.  “Something was always a little off about him. He had this nervous giggle,” said psychotherapist Rebecca Alexander, 33, who lives across the street.  “He’s a big, giant guy,” added another neighbor, who declined to give his name. “He looks like Lenny in ‘Of Mice and Men.’ He’s a gentle guy with a 1,000-mile stare of someone who is clearly on meds.”  Hero NYPD cop Eder Loor was released from the hospital last Wednesday after a man off his meds stabbed him in the head in East Harlem. With Christina Boyle
A man armed with a knife was shot and wounded by police on the upper East Side Monday afternoon -- and his mother was  also struck during the confrontation, police said.