PITTSBURGH — The 16-year-old accused of stabbing 22 people at his high school was dazed ''like a deer in the headlights'' later and does not fully grasp what he did, his lawyer said Thursday as he sketched out the beginnings of a possible mental health defense.
Deepening the mystery of what set off the violence, attorney Patrick Thomassey said Alex Hribal had no history of mental illness or troublemaking, did not abuse drugs, and was no outcast. He described him as a B or B-plus student.
''In a case like this, it's pretty obvious to me that there must be something inside this young man that nobody knew about.''
The prosecutor, meanwhile, said Hribal remains an enigma.
''We have very little information about him,'' Westmoreland District Attorney John Peck said, ''except for the fact that he was a student, his age, and how he was as a student.''
Authorities seized the family's computer as they searched for clues to Wednesday's rampage at Franklin Regional High, about 15 miles from Pittsburgh. Authorities said Hribal armed himself with two kitchen knives and stabbed 21 students and a security guard before an assistant principal tackled him.
The slender, dark-haired boy who looks younger than his years was jailed without bail on four counts of attempted homicide and 21 counts of aggravated assault. Authorities are prosecuting him as an adult, but Thomassey will try to have the case moved to juvenile court.
He plans to get his client examined by a psychiatrist.
''I think his mental state now is unstable. I'm not sure that he recognizes the enormity, if that's the word, of what has occurred,'' Thomassey said. ''And I think in his own mind he's trying to figure out what happened here, as we all are trying to figure out what the heck happened here.''
The attack seemingly came out of nowhere, the lawyer said.
''Both parents are good parents. They're parents who pay attention to their kids, who eat dinner with their kids every day, who understand their kids' friends, who, you know, care about who they hang out with.''
But a school security consultant said it is often the case that attacks are perpetrated by kids who were not on officials' radar.
''In incident after incident, when you start peeling back the onion, you find there were some indicators, there certainly were some issues. But it takes some time to find,'' said Ken Trump, president of National School Safety and Security Services.
''Often times, it's not the kid who's the class clown or acting out the most, but the kid who's changed, who's turned more introverted or withdrawn,'' he said. ''I think the one consistent theme across all of these is mental health.''
Ten boys remained hospitalized, three in critical condition.
Police and doctors said one victim, a 17-year-old whose name was not released, had surgery again and was in very critical condition after suffering a knife thrust that pierced his liver and missed his heart and aorta by fractions of an inch.
Another student, Brett Hurt, 16, told of being stabbed in the back.
''What was going through my mind?'' Hurt said at a hospital press conference. ''Will I survive or will I die?"
Hurt said he pushed his friend Gracie Evans out of the attacker's way, and then after he was stabbed, she stayed with him and put pressure on the wound.
''Gracie was screaming and asking me if I was all right,'' Hurt said.
Hurt's mother, Amanda Leonard, said of Evans: ''I've hugged her and kissed her. I have told her thank you. There is nothing in the world I can do for that girl that can thank her enough for what she has done.''
As for the assailant, Hurt said he hopes that someday ''I can forgive him, and everyone else who got hurt can forgive him. First of all, he needs to forgive himself.''