Weird situation at the gym, how would you have reacted to this incident?

I'm a member of YMCA gym. It's a pretty nice YMCA location IMO. Large pool, tons of machines (never any lines), everything is always being wiped down and clean, and the free weights are always been restacked and cleaned and not just laying on the ground like most 24 Hour Fitness type gyms.

Best part is the locker rooms. Single enclosed shower stalls, hot tub next to the shower area in case you want to get some hot-cold cycles in. Always has a lot of fresh clean towels. It's just a really…