^ 1) from a stop there's no reason to put out the sort of torque to make it spin, just get things turning in an easy gear while you warm up.
2) jumping out of the saddle, you can make it slip a bit initially, but I've never found it to slip emough to matter. Also, I just don't find the trainer conducive to sprint intervals, so I don't so them on the trainer.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.