Rumor was he was high on X at that show. I believe he admitted to being high on coke at the San Fran pro, & party and being high hot on coke with CT the day before. I believe CT said and at me is to went to sleep that night while Chris was up all night doing coke until the next day
I can only go by my own experiences of X but I can imagine no human on earth managing to stand on stage under bright lights and hide the fact they are fucked up on X.
I once saw a video of myself and the people I were with, all dancing in a huge tent to techno, all fucked up on X and I was so sure you wouldn't be able to tell I was high. I remember when the video was taken, I remember feeling absolutely perfectly normal. Could have a conversation with my parents, I swear.
That was how I thought it would be - the truth was that the the video was the freakiest, scariest thing I've ever seen of myself, my eyes were fucking popping out of head - it was insane and absolutely the worst I have ever looked in my entire life and I'm an ugly guy as it is.
I guess if you're a habitual user it might be possible