The action starts at 1:00, and it’s over in less than 2 seconds. The front kick or "Teeb" in Thai, is often referred to as a foot jab, usedto annoy the opponent, to drive him back, to get him to drop his hands, to disrupt his attack, to set him up for a follow up, such as a round kick.
But here we see a fully committed front kick. I have often written of this–the importance of utter commitment to one’s technique, to explosiveness. In the replay at 1:38 we see the opponent is blasted off his feet by Ian Jacobs’ powerful kick.