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Jim Schwartz is a passionate guy. He likes to yell during the game sometimes, often at the refs.
Sometimes he calls timeouts so that he has more time to yell.
And sometimes he likes to yell at opposing coaches when he feels disrespected.
Presumably, he yells a bunch in practice, too. He gets fired up, and outside of Detroit, he just looks like a hothead.
But it's a mistake to assume Schwartz's passion only takes the form of tirades and emotional outbursts. It also takes the form of personal connections with his players. He endears himself to his players by wearing his emotions on his sleeve.
What Schwartz is doing is creating a football team that actually cares. By caring about his players, he makes people want to play—and play hard—for him.
We got a small taste of that when Schwartz went to personally recruit Kyle Vanden Bosch two years ago. Vanden Bosch said he was skeptical and had "lots of questions" for Schwartz when he showed up on his doorstep. But ultimately he signed, because he had "ultimate faith" in Schwartz.
The next season, Schwartz pulled in another free-agent prize from the Titans in Stephen Tulloch. Tulloch signed a one-year deal in Detroit in 2011 for well below his market value, and playing for Schwartz was the biggest reason why.
So when Tulloch's one-year deal ended, and the prolific linebacker re-entered the market, he never really had any intention of leaving Detroit. I'm sure Tulloch gets along well with his teammates and sees long-term potential in the team, but mostly, Tulloch just wanted to continue playing for Schwartz.
And as we saw after the deal was done, that feeling was mutual. Schwartz got misty-eyed introducing Tulloch after his new deal was signed, and his voice wavered through the entire press conference as he tried to hold back feelings of pride and happiness for his friend and middle linebacker. That's not lost on Tulloch, nor on any of the other players who look to Schwartz as a leader.
Schwartz is an passionate guy, and sometimes it reflects poorly on him. But the same passion that makes him chase Jim Harbaugh down the football field also makes him a big cuddly teddy bear in Tulloch's press conference.
The combination of the two elements makes him the type of coach guys want to play for. Sure, he might cuss you out in practice for blowing an assignment, but he'll also let you know when he's proud of you and cuss out a ref for blowing a call in your defense.