Do you see the chopper?

This is one of those frustrating James Bond movie chases where there are a hundred different scenarios where it could have been stopped or made less dangerous by some better decision making. For starters, why did the baddies here decide to use their mode of transportation as part of their strategy to kill Bond? Surely they knew, and would of course eventually find out, they had a death wish if anything disturbs the helicopter rotors.

And why doesn’t Bond and Wai Lin just stop? Get off the bike, disappear in the crowd?