Well it's all in the words you choose. I mean, you can usually tell who the tough guy types are straight away, they like to give you grief about things. Now the key isn't to cajole them into it. Threatening them doesn't work either, or talking down to them. You can compliment them, but you shouldn't be too obvious about it. So say you ask them what skills they have and they say 'I can break a person's neck with one hand', you go 'really, I saw a guy break his neck once, must take a lot of force to do that with one hand', even though what you're really thinking is somewhere between 'this fucking psycho' and 'good fit for security'. So you segue off talking about neckbreaking and suddenly he's not cold any more, and you can say 'so if you're interested, security doesn't have anyone like you, I reckon you could teach them a thing or two.' Appealing to their vanity, you see. It's like a boxing match, there's no point wasting all your good moves in the first round. You spread it out, take a few dives if you have to, but if you stick it out right then they'll think it was their idea to hit the mat at the end.
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We have the time, we just need the stamina.