A former Marine combat instructor testified that Daniel Penny misused a combat maneuver when he fatally choked Jordan Neely aboard a Manhattan subway, saying he appeared to have attempted a “blood choke” and should’ve known to let go after Neely lost consciousness.

Daniel Penny “did for others what we would want someone to do for us” — defending panicked subway riders from an “aggressive” Jordan Neely — when he put the troubled

Daniel Penny is charged in the chokehold death of Jordan Neely in a NYC subway. Opening statements were delivered on Friday.

Witnesses from the subway train said they feared Jordan Neely but also described the horror of watching him die in a chokehold.

Daniel Penny's martial arts instructor from the Marine Corps took the stand Thursday for day six of witness testimony in Penny's trial in the chokehold death of Jordan Neely.

In the trial of Daniel Penny, a man accused of killing a homeless, mentally ill man on the New York City subway, jurors are hearing from experts on chokeholds following an admission from a key witness that he lied to police.

Penny held Neely in a chokehold for about six minutes — including for more than 50 seconds after Neely stopped moving — according to evidence presented in his criminal trial.