I think the last couple of day's trading has LNG written all over it. When they worked up to a 10% stake in MEL they didn't bother mucking around, they simply bought and smashed the price up from around the 30's to 60. Very similar MO today here at WCL.
Essentially it is cheaper for a company to buy at anything under the price they are prepared to offer. smart by them if it is the case.