Yeah, it was the weather conditions on Saturday that caught my eye. It was glorious here in Fife. As others have said, we dont know the full details. Maybe the two walkers didnt have enough water, and felt weakened through dehydration. We've all made that mistake. Maybe there was a twisted ankle involved? Again, we just don't know.
On an unrelated note, it was on Beinn a Chroin that I had my windiest ever summit. I literally had to crawl on my stomach, commando-like, to touch the summit cairn, before beating a hasty retreat into the lee of the hill.
A nice hill, under-rated IMO.