Not particularly happy with this unmerited bombardment, the tortoise gets back on its skateboard, and a kind friend gives it a shove backwards, away from the machine. Now, any projectiles the machine fires at the tortoise will take longer to arrive, as it is moving away from them. If the tortoise is given a big enough push, it will move faster than the balls, which will never reach the tortoise or the mirror, and certainly won't be able to deflect off the tortoise and the mirror, into the tortoise's eye!
Let's now dim the lighting and replace the machine with a powerful torch, pointing at the tortoise, and 'firing' light at it. When the tortoise is sitting still, it can see itself in the mirror. If we pushed the tortoise so that it was moving faster than the speed of light, by our analogy the light would stop hitting the mirror and the tortoise would no longer be able to see itself. Its reflection would vanish!
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