However, on the streets itself, to the uninitiated or novice in martial arts, backthrust CAN be a deadly move.
I'm not talking about half-assed backthrusts, I'm talking about those where u really swing and extend ur leg fully with power. A single blow will deliver enough force to induce possible cardiac arrest. There was a case many years ago where a simple street fight as a result of a minor scuffle resulted in a fatality cos that fella used a backthrust and induced cardiac arrest in the victim.
What happened after that is hazy in my memory. But this article appeared in The New Paper many years ago.