Several possible outcomes after an incomplete takeover.
They come back in nine months at same price ( OPSM ).
They come back in a year at 1/4 the price ( Pacifica PBB )
They come back in a year at a better price ( Auspine ).
If they get up to around 80% and price is the only issue, it makes much more sense to wait at least 6 months and offer a higher price to the holdouts, than it does to offer a higher price to everyone now.