Nine's lasers can be blocked by Endeavor's own attacks, clashing with them should easily make them harmless even if they aren't fully dispersed. Hell Spider vs Finger Lasers
Nine's Tornado is formidable, however he never showcased being able to use any other attack while doing that. And he didn't try it again after 100% Izuku and Bakugo blew away his storm. So it probably isn't something he can just make on command, needs some time to build up and they weren't giving him time to do so.
Endeavor won't give him time either.
Or Nine was too tired to make the same tornado again. Which once again, I don't see how he'd kill Endeavor in such quick time before his body gives out. Endeavor has stamina close to Izuku in terms of the damage he can take and keep moving. Even with that tornado he didn't instantly kill Bakugo and Izuku and instead used his dragon things against them.
I see Nine tiring out before he can land a fatal blow on someone who I believe is just as acrobatic as Bakugo. Endeavor could avoid attacks from Shigaraki as well, so it isn't like Nine's speed is too much for him. He can't keep shielding Endeavor's attacks either, holding back such powerful attacks just puts him closer to death.
He barely blocked a single explosion from Bakugo, and it still send him staggering back and his arm was bleeding as well. Honestly the only reason they needed two OFA was because of his storm, and they couldn't have him destroying the island. Endeavor has no such worry here, there is no one else here so he can avoid his attacks freely.