A company's pool is pulled back toward the number of shares rats have not bought, and that pull was rounded down to nothing whenever the gap was under 200 shares.

The drift was rounded down as well, so a pool of ten lost a whole share to a tick that was asking for a hundredth of a percent, and gained nothing back on the tick that went the other way.

RAT sat on ten shares against a target of 209 for 99 ticks running: down one, up one, down one, at $3,501 a share on a company that opened at $2.

That leak was never only RAT. It takes up to a share a tick from any company with a small pool, which is most of the ones rats have floated themselves.

And a tick that asked for no movement at all skipped the walk home entirely, so a company on its way back stalled every time the noise landed on nothing.

So buying a small pool up worked exactly as it should and the walk back down never happened. Nothing was rigged in your favour; the road home was closed.

The pull is now at least one share whenever there is a gap, and the drift rounds to the nearest share instead of always down.

A pool that has been bought out now climbs back to where it belongs at a share a tick, so a company finds its way home over about a day.

If you bought RAT while it was stuck up there, the price coming back down is the fix arriving and not a second fault. Your shares are marked at what the pool will pay for them, and on the way home that is well under what you paid.

Separately, the upward trend was taking its half a percent a day out of the whole company instead of out of the shares still in the pool, so a tightly held company would have had its target eaten down to a single share in about nine days.

The trend now takes its rate out of the shares left in the pool and can never reach the shares rats own.