If you have the luxury to do so, place/channel your shield once Recharge is on cooldown. Otherwise Torvald can simply drain it and repair his own shield in one fell swoop.
The shield can be used to interrupt his lock on attack. Best used in the beginning of a fight as he can't siphon higher shields then he already has at full health.
Andros will typically be using a load out with the card Abyss Walker which basically heals andro whenever he uses nether step this means that Cauterize is good against andro. If you play against a team with andro and a healer caut is a good pick