If Cai and Leymore die?

I went to test this, as after some reading, I found on some different sites that if Cai and Leymore die, you can still continue with the mission. Well, I proved that to be true.... With one catch, while as the monsters still spawn and if you're close enough to the end, I THINK you can finish, the next gate will NOT open if they die, well, either that or I'm just an idiot who can't find the last remaining pole. They died for me, Leymore in the last room before the second gate, and Cai in the big room where bosses/mini bosses normally spawn in Tara SMs.

All i know if i have been on that mission for 500 lvs and i need to finsh it before lv 1k

I'm almost to 1K total, but, look at the bright side, at least it can't get any harder.