at what price does the buying start?

Good question. It depends on how successful they are at bringing the price down, If they drop it a few cents every day they could take this down to the 1.80s. Or if they're lucky some "news" item could hit the wire and cause a panic and they may hit stop losses. Its happened many times for KRY (and many others).

it doesn't take much to make a few $s on millions of shares this way.