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.

Follow The Post’s live updates from the courtroom as Daniel Penny, 26, stands trial for manslaughter after putting homeless man Jordan Neely, 30, in a chokehold onboard the subway in 2023.

Prosecutors have called more than a dozen witnesses so far in the trial of Daniel Penny, the Marine veteran charged in the chokehold death of 30-year-old Jordan Neely on board the subway last year.