The RIOT Act

[Kaden]

To last hit at a tower its difficult in 2v1 because, you usually not only have 2 harrassers, but the minions, aside from the big cannon one, die on only 2 shots of the turret. You have to be able to hit a minion before the turret hits in then follow up with 1-2 more hits before the turret wipes it out... depending on your own damage output.

Melee minions die in three shots. If a Melee minion is at full health, let it get hit by the tower twice, then auto-attack once for the last hit.

Caster minions do die in two, though. To last hit them at the tower you auto-attack, let the tower hit, then auto-attack again for the gold.

That assumes your bonus AD is below Pickaxe level.