I've decided to rule that for the sake of current events, a tag duel will use separate life points but a combined field/graveyard, and the duel isn't over until both players in a team are taken out, meaning that when one player reaches 0, as long as their partner is still up, they can still play. At damage calculation, the turn player will take the damage. If the turn player reaches below 0 LP, their partner will take the damage instead. Turns will rotate as they do in the Tag Force games where Team 1 Player 1 goes, Team 2 Player 1 goes, Team 1 Player 2 goes, Team 2 Player 2 goes, and so forth.