If the rider behind you is obviously trying to attract your attention and slow down, do likewise. Advantages More riders are likely to make it to the end of the run. Inexperienced or more sedate riders will always have other riders around them. The slower, possibly inexperienced riders, can end up with a queue of frustrated people behind them. This could lead them to feel pressured and to possibly make mistakes.
More progressive riders can find the progress bitty and interrupted.
They have to keep stopping as the slower riders drop out of sight behind them. This is a very popular method. Most of the big rider groups who expressed an opinion say that this is the only way to go. It may not be the only way, but it does have major advantages. This rider remains at the front.