Didn't see the Colorado-Kansas game, but watching the clip maybe the involved officials were more focussed on separating the players and none of them saw it. I'd hope that the conference would act anyway.
I did watch the Arizona State-BYU game. That was some ending. Even in all the chaos, it looked like the crew just worked their processes and then let the authorities deal with the fans on the field. I didn't see a TV shot of the R without a uniformed officer in close proximity the whole time. I thought they handled it well and did the best they could in the circumstances.