BOSTON — A drugged-up maniac who tried to hijack an MBTA bus with a butcher knife — chased the driver in circles, stabbed through the bus doors, and then grabbed a cop's gun and pulled the trigger — is being held without bail.

His own defense attorney didn't even try to pretend he wasn't a threat.

Prosecutors walked the court through the sequence. Martin boarded a bus, whipped out a large butcher-style knife, and demanded the driver hand over the vehicle. When the driver ran, Martin chased him around the bus. In circles. Around the bus.

When MBTA transit police showed up, Martin fought them too. During the struggle, he grabbed one officer's firearm and pulled the trigger. Nobody was hit — by some miracle.

"I don't believe that there's any way to qualify his behavior other than 'dangerous,'" a prosecutor told the court. Which might be the understatement of the year.

Martin's defense attorney — who had the unenviable job of explaining any of this — blamed it on drugs. Marijuana, Percocet, and Adderall, plus an "immense amount of stress" in Martin's life.

"Neither he nor I is under the impression that there's any chance your honor is going to review everything and find that he wasn't a danger to the bus driver, to the police officers and the people at the station on this day," the attorney said. "It's beyond dispute that he certainly was."

Beyond dispute. His own lawyer said that.

He asked for $1,500 bail anyway. The judge said no.

Martin remains jailed without bail. He's due back in court next month.