system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In Hawking radiation, how does one of the particles getting sucked in let the other one get away?
gpt
The problem you are having is that this idea is a simplistic explanation that hawking came up with to try to communicate this idea. 

You will need to dive a little deeper to resolve the issues this visual gives you. Short answer to your question is, it doesnt, there isn’t really particle pairs being created *in the way you are thinking* . 

We say that for every particle there is a field associated with it, when there is no particle that field hovers around 0. Never exactly zero due to uncertainties. There is no reason in this instance to favour either the particle or anti particle and so you can think of each empty bit of space as having equal “chances” or equal “amounts”  of each as if they cancel out. even though the field is hovering around 0.  This is still a bad picture if you start asking more technical questions but is a little better. Im not sure how to explain this without knowing what you know or dont know because quantum field theory is not the most normal language friendly field.

Now what about the actual Hawking radiation? Well when the black hole comes into being, you can think of it as “disrupting” this “hovering above zero” for the fields in empty space, so they don’t perfectly cancel out anymore. This leads to what an observer would see as a particle being emitted from outside the event horizon. Never at the event horizon always outside it. 

Its important to remember that only the distant observer looking at the black hole would see radiation. If you free fall into the hole you will find the radiation is essentially undetectable (not zero as some popular science claims). 

If someone again sees the issues with this explanation,  of which there are many, and wants to get more technical, im happy to answer.