Hi there I am just wondering what happens if...

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Extradition is a bit technical, and there is a treaty between Canada and the US that allows extradition for a specific list of crimes. What is the specific charge, as whether extradition can happen depends on that? As for whether it will happen, that is often a separate question of the seriousness and how willing the authorities will be to expend resources to go through extradition proceedings.

Was there serious bodily harm? Assault occasioning bodily harm is covered by the treaty, but common assault is not. With that said, excepting a very brutal assault, it may be difficult to actually obtain an extradition for most assaults. Usually the arrest warrant would be issued and they would just try to pick him up if he returns to Canada.

Even within the US, often people won't be picked up and sent to another state for common assault. It's unfortunately an issue of resources.

It can be worthwhile just to try to get the warrant issued. If he comes back, they can pick him up then for the charges.

I completely understand. The police will file charges if there is probable cause in the evidence you've provided them. At that point it may just be a waiting game.