In the midst of chaos and noise Walt tried to keep it up by looking at the queue but there was no Diana. He didn't panic because he thought perhaps she was already inside the restroom, hence he concetrated on the guitarist and after sometime, he grew suspicious. The line to the ladies restroom was still full since the whole city had turned up for the carnival and the cold made everyone want to use the toilets.
He stood up and walked down to the restroom and leaned on a tree just near it, anxiously awaiting for Diana. Every time he felt like someone was coming outside, he was like "There she is..." and he got disappointed when a pale brunette girl came outside, and many of them were on drugs their faces weren't pleasurable to look at. His nerve went over the roof after he realized Diana wasn't there at the carnival anymore.
Walt immediately reached out to Doctor Sheffield although he was scared of what to say to her.