Ah, but crits don't matter once your down. The first attack should not kill you. The second attack should probably bring you down to 0HP. The third attack will give you a death saving throw. (This is how BG3 works right? PnP a crit is 2 failed saving throws, but in BG3 it's just one?)
On your turn, you might fail a death saving throw and bring you to 2 total.
Then it's your party members' turns who can bring you back up. Right?
Although we are getting a bit off topic : I forget how I failed to save the character, but the next turn the minautaur ignored Laezel in melee and instead ended the dying character. Normally, creatures who wish to live focus the active threats, but anyhow. No matter, we have tons of Revivify scrolls. It did not matter to me: the 3 left characters focused on ending the two minautaurs rather than saving a character.
In retrospect, using Dex or Wis spells would have been much much better than my ambush/trap attempt.