TurboHercules didn't make a "request" to IBM as a "bluff". Instead, IBM threatened TurboHercules with a previous letter.
Also, TurboHercules never attacked IBM with patents (I guess TurboHercules doesn't even own any patents). All that TurboHercules did later was to lodge an antitrust complaint with the European Commission. However, lodging a complaint with a regulator is not an act of aggression. Regulatory agencies will only take action if a company's conduct is suspected of being anticompetitive and unlawful. The European Commission launched an investigation in July: http://fosspatents.blogspot.com/2010/07/european-commission-...
That would not have happened if there weren't serious concerns over what IBM is doing. The outcome of the in-depth investigation remains to be seen, but the European Commission doesn't launch such investigations unless there's at least a strong indication of possible wrongdoing.