Unfortunately, a little bit of Brazilian jiu-jitsu training doesn't mean you're a favorite to win a street fight.
No martial arts techniques are punch proof. And if you haven't trained extensively against real resistance with strikes, you may not be prepared for a street altercation. The clash in the video below takes place at a school bus stop. It's clear one of the fighters has a little BJJ training, as he tries to use it during the fight. He didn't do too bad for himself, at first that is.
Sadly, it didn't work out well for him, as you can see. He starts off with a nice takedown and then took the kid's back. Then he lost the position as he tried to finish the fight with a rear-naked choke, but the other kid slipped out and started to punch and kick his way out.
Jiu-jitsu fails in a schoolyard throwdown
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Eventually, he gains top control and hammers away with ground-and-pound shots from above and forces his opponent to snail up in a "no mas" position. The kid takes pity on who defeated foes and decides to end the school scrap and walk away.
Street fighting is no longer a one-on-one fight between two unarmed people nowadays. Jiu-Jitsu, which advocates ground fighting, is certainly effective but unsuited to modern street fighting. Another fundamental error in the defense of ground combat and its alleged involvement in street efficiency is the argument that Master Helio Gracie often gave to defend his discipline:
“In the street, unlike the UFC and rounds of 5 minutes, there is nobody to stop a fight.”