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If I ready an action to use a combat maneuver against a spellcaster when he starts casting his spell, does he need to make a concentration check? If he does, what would be the DC? The rules only seem to cover the grappled/pinned conditions, but I believe that bullrushing or tripping a spellcaster should induce a concentration check.
It's not covered, but I'd probably categorize it as Vigorous or Violent motion.