The potential ~$64bn takeover of Anglo-American (AAL LN) by BHP has dominated the news in recent weeks, but the clock is ticking, at 5pm London time tonight, the door will close, for now at least. It will come as no great surprise if BHP walks as Anglo’s CEO Duncan Wanblad and the rest of the AAL board appeared to have no interest in discussing a bid – at least at the current price point BHP’s offer was implying. However, there is still a chance that BHP could lob in a “best a final” conservative bid aimed at disgruntled shareholders before the window closes, making BHP a tricky proposition at current levels.