1. No, Saitama even says he doesn't feel excited when fighting Garou, due to Genos's death. In any other circumstance, yes he would feel intense emotions from someone fighting him equally. But that's a consequence of it being tied to intense emotions, not the only activation requirement
2. No, it is not. It happens very fast, but it's not instant. Also if Saitama resisted it, there'd be no reason to kick it away, he would have just stood there as it did nothing. It's clearly meant to just be him kicking it away before anything happens.
Can even see that Saitama and Garou's fists move a little closer before they've been teleported. It's not resistance, he clearly just kicked it away