While my reaction times to Johnny tick throws have waned since Evo and Evo prep time, you can usually react to Johnny dash in to throw if you train yourself to react to it. I was able to consistently stuff dash in throws by mashing 2P as soon as I saw Johnny dash in, so it's risky if the player can react to it. While the damage can't be that much (for Slash Sol anyways, since no dust loop), it's still free damage. I can still somewhat do it today, but now I accidently hit 2K (too much 3S I guess), which Johnny hops right over. :P
But, if Paul is a noob and can't react to it, go for it. ^_~