system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: We’re always taught to never pull a sharp object such as a knife out of someone who is stabbed. How exactly do medical professionals pull it out then? Would they have to pull it out the same way anyway?
gpt
It's all about setting and training. 

An untrained bystander with no medical equipment pulls a knife out of a stab wound, the knife is no longer keeping the blood in and the victim will bleed out faster.

A surgical team with medical equipment pulls it out and can get the veins sewn together and close the wound before the victim bleeds out. 

That being said it is still risky even for trained professionals. They have to act quickly to avoid killing their patient.