Let’s say your running a race at school and there’s a fat kid named Buffer that’s in the race. To be nice you might give Buffer a head start, let him start, count to 30 then start the race for everyone else. By letting Buffer run first you’re giving him a chance to finish the race before you do.
Now Buffer isn’t some normal fat kid, he’s got control of time. If you run behind Buffer time runs normally. But if you catch up and run ahead of Buffer time will freeze until Buffer is able to run past you and the race continues.
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