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I understand your points (both santino and umop3pisdn) but look to explain in more detail it was a technical corner (90 degree turn) and the race had just begun (1st lap) so everyone was going hard and some too hard for the said technical corner causing this instance of people braking by jumping up the back wheels. Luckily no crash happened (only 5 laps later).
At the end of the day its all about being professional and respecting those who are riding around you, which I do.
I'm 10 time more afraid of scared people like you than people slowing down fast (i guess that is what you refer to).
Try to Backpedal hard at +20mph with a decent gear, extremely hard. So no one will slow down like crazy in front of you. You can only do that with very low gear....impossible to qualify with 70" gear.
Scared people panic and behave in a much more dangerous way, lateral move without looking, not announcing line change, not holding the line, not steady pace....
After some time, you can spot them at the velodrome and stay far away from them. If you can't, you will stick to the wrong wheel as you can't spot either the strong guy capable to break out. And stay at the front of the pack, back is always much weaker and more dangerous (but you need serious training/legs to do that).
You still have time to get some training at the velodrome...not too late.