Robert saw Steve kiss Michelle but walked out just before Michelle shoved Steve away, so he missed her slap Steve as well.
I have no idea why Robert and Daniel have spent hours all dressed up and roaming the cobbles though. They've managed to get dressed, track down Ryan (nobody would have cared if he had stayed missing), come back, wander about a bit, go to the pub, see Steve kiss Michelle and realise Flora is not as daft as she seems, wander about a bit more, pack a bag, leave the Street, and all before Michelle even had her make-up on.
Surely getting ready that early just made them more likely to be hot and sweaty before the ceremony even started. In the Bistro.
They were getting married in the Bistro! Does it have a wedding licence? And where will they go for that hour that they're not allowed to serve drinks after a ceremony? The Rovers? Can they hand out free alcohol after a wedding to get around that rule?
I've decided that Pat is going to shoot himself rather than get arrested by the police and go to prison. Nicola will be lured to the builders yard, along with Seb, Eileen, and the baby, even though she's five minutes out of the operating theatre and should barely be walking at this point.
Pat will somehow get his hands on the baby, but the police will arrive thanks to Jack, and we'll hear a gun shot out of sight.
There will be a lot of screaming and running to see if he's murdered his own grandson and then we'll see Pat on the floor but the baby will be safe.