If the volume is low enough, one could "trade shares between themselves" trade between themselves (and if no one else is buying be the only volume) - by buying with one account and selling with another. This only may have worked when we were trading at much thinner volumes (and it can only be done so often and be effective).

The point of doing so is that it may force people to sell shares, which those with level 3 can see (i.e. stop losses). This may escalate as people see the share price fall, and volume rise as stop losses are hit and others willingly sell. They can then accumulate those shares which will often be more than they lost during the frisbee process.

Personally, I'm not sure if that's what actually happens - but that's how it would work in theory.