Leeds United midfielder Adam Forshaw says manager Jesse Marsch can lose it with the players.
Forshaw admits Marsch knows when to turn things on and off.
He told the Daily Mail: "As a character, he is very personable. You walk past his office, the door is literally open. There are bits of different terminology, full-backs are outside-backs and you hear him mention red zones [between the lines]. But you quickly pick up on it.
"He's nice but can switch if he needs to. After one game, a couple of substitutes grumbled about doing pitch runs and he's made it clear 'That is your f***ing job'.
"We were doing phase play in training and [goalkeeper] IIlan Meslier gave a slow pass out, a sloppy one. Jesse ordered him to do it again, which the lads weren't expecting. Illan gave another slow one and Jesse has ripped into him. Five minutes later, the gaffer is laughing, saying 'I still love you'. It was a different side from the manager that the lads respect."