If I have learned one thing in DF, and also PF, it's that it's never just one person's fault and that if you hope for objections when you apologize and offer to leave you will get none.
The majority of people have absolutely no idea what's going on around them and even if something was their fault, they'll just reply with a generic "happens/ no worries/ it's okay" if someone else apologizes. I did it so many times when I was either unsure whether it was really my fault alone or when it was partly my fault but someone else's mistake played a role and I got pretty much always a generic form of "I forgive you" without them chiming in about their own mistake.
And as for the last boss in Troia: there is not a single mechanic where one player can wipe the party. None.
You get puddles and even if two people stack, they get both 2 stacks and zombie status is at 3. So unless the other person already ate something (=their mistake), they can't get zombie'd by you.
You will always have at least one wall to get knocked against unless everyone nuked a wall which would require the tank to deliberale ignore melee range and stand far outside.
The stack during add phase can easily be taken by 3 people, 2 if you push it and have some mitigation on the squishy.
For spread markers even squishies can survive two hits at once so unless you had 3 people (= someone else's mistake too) stacking with spread markers, it can't wipe you either.
Everything else can simply be healed through or worst case, one person dies and gets rezzed and you continue.
So no, it's simply impossible that you alone wiped the party twice.
You may have made mistakes but someone else also had to made mistake and/ or the healer and/ or tank reacted poorly to what was happening too. Because the dot from getting knocked into the wall can be healed, spread markers stacking can be healed, stack with less than 4 can be healed, healer can rezz you. And all 4 tanks have ways to protect/ heal a squishy if something goes wrong. It may not have been their mistake in the first place but it's still poor reaction to let things cause a wipe that can be salvaged.