In standing firm and holding its offer for 61% of Sky at £14 ($18) a share, valuing the European pay TV and broadband operator at £24.5 billion ($31.5 billion), 21st Century Fox has effectively moved into a stalemate position. Any bid by Fox is spending Disney’s money, but Disney has already turned its financial taps on full following an accepted $71.3 billion takeover of certain 21st Century Fox assets. There could be a compromise, yet any collusion between Fox and rival bidder Comcast behind closed doors would probably be illegal – yet this week’s outcome is precisely the same as if they had done just that. What the lower than expected bid has done is given Comcast more time to…