You can leech off of his shield similar to Barik's barricade. Let your team know that you can and maybe they'll do their best to let you take care of it. Be careful more experienced players will catch on quickly and attack you during recharge.
Keep an eye on whether or not Androxus is using the Dark Stalker legendary card. If not and you know Nether Step is on cooldown, Makoa can use Dredge Anchor and Androxus will not be able to Nether Step away.