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People need to have a good eye for things, especially street thugs, they really need to have a good eye to get by.
Some people you can mess with, and those you can't, you just don't mess with.
In the United States, a country rife with guns, it's not uncommon for two people to start shooting at the slightest disagreement, but for those making a living on the streets, it's still important to distinguish who you can't afford to provoke.
As an inheritor of a Mafia family, as a professional hitman who handled dirty and violent jobs, and as someone who didn't bother with warnings before shooting, Francisco emitted an aura of someone not to be trifled with — an aura that Gilson and his boys could easily pick up on.
If you can't beat them, don't challenge them. The saying "A wise man knows when to bend" applies everywhere; not even street thugs are so foolhardy that they seek out death, so Gilson kneeled without hesitation or mental burden.