Unless you're the kind of warrior physique that WGKitty sports, towering over your flabby exceptional aggressor, laughing, Canadian law is actually sensible here.
You can't be kicking someone as they scream for mercy and you MUST be the one who reports the altercation to police, cooperate, etc. But Amy Hamm could have kicked yaniv in the balls and hog tied him in that women's bathroom if he'd approached her.
The law in Canada in terms of self defense is pretty cut and dry.
Self-defence against unprovoked assault
34. (1) Every one who is unlawfully assaulted without having provoked the assault is justified in repelling force by force if the force they use is not intended to cause death or grievous bodily harm and is no more than is necessary to enable him to defend himself.
Extent of justification
(2) Every one who is unlawfully assaulted and who causes death or grievous bodily harm in repelling the assault is justified if
(a) they cause it under reasonable apprehension of death or grievous bodily harm from the violence with which the assault was originally made or with which the assailant pursues his purposes; and(b) they believes, on reasonable grounds, that he cannot otherwise preserve himself from death or grievous bodily harm.
Self-defence in case of aggression
35. Every one who has without justification assaulted another but did not commence the assault with intent to cause death or grievous bodily harm, or has without justification provoked an assault on himself by another, may justify the use of force subsequent to the assault if
(a) they use force(i) under reasonable apprehension of death or grievous bodily harm from the violence of the person whom he has assaulted or provoked, and(ii) in the belief, on reasonable grounds, that it is necessary in order to preserve himself from death or grievous bodily harm;(b) they did not, at any time before the necessity of preserving himself from death or grievous bodily harm arose, endeavour to cause death or grievous bodily harm; and(c) they declined further conflict and quitted or retreated from it as far as it was feasible to do so before the necessity of preserving himself from death or grievous bodily harm arose.
Provocation
36. Provocation includes, for the purposes of sections 34 and 35, provocation by blows, words or gestures.
Preventing assault
37. (1) Every one is justified in using force to defend himself or any one under his protection from assault, if they use no more force than is necessary to prevent the assault or the repetition of it.
Extent of justification
(2) Nothing in this section shall be deemed to justify the wilful infliction of any hurt or mischief that is excessive, having regard to the nature of the assault that the force used was intended to prevent.
Jonathan has been very lucky so far in the cases where he has tried to assault people or cause provocations that he hasn't had someone stove his face in. I think Yaniv realizes this, which is why he's only attempted to assault press so far. They just want to document his insanity, where as a member of Joe Public probably wouldn't put up with him flailing about at them and just knock him over.