Shelley Johnson looks like the panicked face emoji. Eyes as round as a full moon, sclera visible. Eyebrows aiming to introduce themselves to her hairline. A mouth as open as an ill-fated opera singer.

A machine that’s been smoothing sheets of ice almost as long as the Chicago Wolves have been playing hockey in Rosemont is due for replacement. The Zamboni ice resurfacer — seen during intermissions ...