If a guy has to walk away from me a hides behind a machine at gym to fix his trousers did he have a h*rd on?

He’s my best friend but he was doing a certain exercise with me then walked away immediately and started adjusting his trousers standing behind this machine and I followed him and he sorta backed away a little then after a few secs he was back to normal that happened

If a guy has to walk away from me a hides behind a machine at gym to fix his trousers did he have a h*rd on?
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