As this is a site for rumour and speculation...Gear horn CB tripped and forgotten about. No U/C or util hyd problems as surely there would have been a call / diversion to black another runway.
Come on gents, how many times have you forgotten to reset the CB and during a busy sortie, said what you thought you saw? I suspect alot of people. We are only human.
Glad everyone was ok, a few damaged egos but no injuries.