Can't steal anyone's phone and think you'll get away with it
Phone Theft Turns Into A Knife Fight And Stabbing In Bogota
An actual "knife fight" would consist of at least 2 individuals with knives fighting each other. This was one person stabbing another. Not even close to a fight
life is cheap in Colombia
"A basic smartphone in Colombia typically starts at around 200,000 pesos (approximately $50 USD) and can go up to about 250,000 pesos (around $65 USD) depending on the model and features." - Google
It's usually the thief that gets the upper hand in these situations. Coz they've already got their adrenaline pumped. If the knife was originally the attackers? EVEN BETTER.