If you accidentally feeding his reversal,try to create distances as far as possible and try to dodge it by moving and jumping when he shot the reversed damage, since the damage are reversed in projectiles type which make it harder to hit movingtarget
While Androxus is channeling Reversal, take the time to reload your weapon, switch targets for a moment, or escape if needed, as it's detrimental to you to attack him during this time.
It's highly probable that Androxus will Refersal and then Nether Step away from combat when in danger. After that, he's mostly a sitting duck, because you probably still have your movement abilities and he doesn't.