Not by our feeling, but by others' seeing.
1) FR.to stock pops hard and against the grain of market peers at the open.
2) People start going "Huh WTF?" and the way things are these days I'm roped in (wholly voluntarily, but I'm pulled into the loop all the same) by those looking for an answer. We look together, pool resources, ask around, usual style.
3) Reasonable intel comes back over the jungledrum (and in all these cases "reasonable" involves a vetting process else you'd get to hear about all sorts of sillystuff rumours on these pages).
4) Instead of keeping the reasonable junglydrum snippet inside the usual walls, I pass it on here at the blog to (as noted yesterday) 'level the playing field', as it kinda irritates me that there's this two tier rumour system in Canada that rarely lets retail in on the juice.