Did the two on the platform get on the bus? What did you say to them, "ner ner ner nerrrrr ner"?
No - turned out they were just collecting tickets for later travel and as it was a pleasant afternoon were taking their time about it and watching the
HSTs▸ and freight trains go through.
There is a very serious point, though, to this business of [ trying to be / being ] helpful at times of disruption and having people not believe the information they're being given. I personally find it natural that when I see someone who seriously needs words of assistance (e.g. may be about to miss their train / bus) to offer them that assistance, but that advise tends to contradict what they had previously understood and is often not believed. Never the less, the 'job' of sewing a seed of doubt in their mind so they re-check / are altered may have been done.
Having been told (dogmatically!) that you're wrong ... walk away; little choice. And don't do any "rub in in" type stuff if you're still around when you're proven right!
Instructions to Community Rail team members are "do not get involved in operational matters" and "do not get involved in complaints". And I can understand why; even if you
are right, walking away rather that pressing the point is unnatural and needs to be learned. And it can be hurtful to volunteers to be rebuffed then they thought they were coin a favour. There is a further issue if advice is offered, taken, and proved to be incorrect. Further still, some volunteers can be wrong just like customers can, and on top of that may not be great communicators. But yet even after these cautions, a few words to alert people in some circumstances feel right rather that watching them miss a train or bus, and speaking with community rail practitioners who've been in the role far longer than me and do it superbly, they take a similar line where appropriate.
I was on the platform at Chippenham a couple of weekends ago when the line towards Swindon was closed and the half hourly 8 or 10 car train to Bath Spa was replaced by an hourly 3 car 158. The train had arrived on what is usually the Swindon side of the island platform, showing on the scrolling board as "Bristol Temple Meads", but a group was determinedly seated with their back to it. A casual comment "are you headed for Bath or Bristol - if so that's the train" was met by an "oh no it isn't - they run from this side". "Do check - it's different today" and I walked on. Well - they did check / joined the train and - good on them - "sorry - you were right" to which the answer was "no problem - it's all being done very differently today because of engineering". Always try to look at the customer's comfort.
I did note the Chippenham platform staff - who are excellent - doing a "sweep" before the train left for Bristol ... so it could be argued I should have made no comment to the passenger waiting in the first place ... will admit to being far more used to this (and a little more proactive) at unstaffed stations.