I doubt Barry has the damage output, as standard, to seriously harm Incubus. El Diablo had to melt a hole through his chest, after which Incubus got blown up with a demo charge, to put him down. Nothing in Barry's standard offensive arsenal can top that. He'd need some prep to come up with something.
I suppose Barry could technically grab someone and dump them somewhere across time, but he has never done it against an opponent before, because it's not in his character to do so. Just like we have seen that he can use phase attacks, but doesn't use them, even against mass-murderers, due to his own morals.