I was out skiing this weekend when my partner had a small tumble on a run called White Lighning in view of skiers riding up another lift. A few minutes later, a patroller came over on a snowboard and asked if we were okay.
Ski Patroller: Hi, are you guys okay?
Demetri: Yea, she's fine
SP: gets on the radio SP to Base One
Base One: SP Come in
SP: Negative Fifty on White Lighting
Base One: Negative Fifty on White Lightning, copy
SP: Okay, you guys have fun
D: See you later
D: (for the rest of the trip) Negative Fifty on White Lightning
What did the patroller mean when he said Negative Fifty?