It's not that they are so bad together; the enemy line up is just worst case scenerio for beidou (her burst doesn't bounce against single enemy). Ororon also produce less energy than Fischl, so Beidou has slight ER funnelling requirement, hence lack of rotation smoothness and worse time after. Fischl also specialized in single target damage, which she was able to pick up the slack from beidou this abyss rotation in team 3 where Ororon isn't there. Fischl and Xingqiu are the MVP this abyss rotation due to their high ST damage, and Ororon specifically boost that, so team 2 ended up being fastest.
Why lv89 characters? WHY
Why Ororon Beidou are so bad together?
It's not that they are so bad together; the enemy line up is just worst case scenerio for beidou (her burst doesn't bounce against single enemy). Ororon also produce less energy than Fischl, so Beidou has slight ER funnelling requirement, hence lack of rotation smoothness and worse time after. Fischl also specialized in single target damage, which she was able to pick up the slack from beidou this abyss rotation in team 3 where Ororon isn't there. Fischl and Xingqiu are the MVP this abyss rotation due to their high ST damage, and Ororon specifically boost that, so team 2 ended up being fastest.