A member of the Defence Forces bit a garda after running out into traffic and "nearly killing himself" in a violent, drink-fuelled episode.
Michael Neary (24) assaulted the officer when he was arrested on a Dublin street in what a court heard was a "horrific" incident.
He had been having problems with alcohol, but his supports were no longer in place during lockdown and he drank "far too much" on the night.
Judge Ann Ryan adjourned the case for a medical report on the accused, saying his behaviour was "off the wall" .
Neary, of Lorcan Avenue, Santry, pleaded guilty to assault; threatening, abusive and insulting behaviour; public intoxication; garda obstruction and violent behaviour in a garda station.
Dublin District Court heard gardaí were called to Shantalla Road, Santry, last April 17 and met the accused, who seemed highly agitated and paranoid.
He had his father's car keys, refused to give them back and, when gardaí tried to retrieve them, the accused tried to escape, running into the path of oncoming traffic.
He was pepper sprayed, but it had no effect on him, and he was arrested and taken to Ballymun garda station, where he kicked out and had to be restrained.
He bit a garda on the left hand, drawing blood.
Neary had dealt with his alcohol difficulty, but in lockdown his support structures were no longer around him, his solicitor Tracy Horan said.
He went to a friend's house, drank far too much and, on the way home, he himself rang gardaí.
"Things got out of control", and when one of the officers applied pressure to his back, Neary "panicked", Ms Horan said.
Neary had an impeccable record in the Defence Forces and had represented Ireland internationally in martial arts.
What happened on the night was a "one off," a slip due to a combination of a back injury and lockdown.