It all depends on how stopping time works. The universe is made of particles that interact with other particles (let's assume classic particle physics), and can be divided in two groups: you
and everything else
. If you just "freeze" the particles that are not you and make them not interact, from your point of view, everything will just disappear (since you won't be able to interact with it) and you will experience severe barotrauma
and die. If you freeze all the other particles but still let your particles interact with them, it will be equivalent to being inside a solid block of concrete (since the air particles will not be able to move).
In order to have useful time stop, you need air (to breathe), photons (to see) and being able to interact with things (in order to walk and move). So you need something more sophisticated than just "stopping things". Some ideas:
- Stopping everything outside a radius of 2m from your body. You'd have a bubble of time which might work, but you'd also break many things easily (if you are exactly within 2m of a person, animal or other complex machine, only half of it will work, which is bad)
- Stopping things gradually (speed of particles decreases proportionally to their distance from you), so you are at speed 1, things 2m from you are at speed 0.5, and things further than 10m are at speed 0 (stopped).
- Some intelligent algorithm that stops only some particles but lets other run (air, light, solids in contact with you). This would give the best results, but it's also more difficult (though if we're talking about stopping time, there is no reason not to have magic )
- Going "outside" the universe and watching everything from there using some interface that lets you see the world without affecting it.