Winter Massacre

I've now run a pure vanilla (removed mod folder, deleted localthumbcache.package before starting to make sure the game is pure vanilla), a pure vanilla with Have Some Personality Please only, and MCC only for a 7 day winter. Result? Nobody froze. It happens, you want to replicate and nail down a problem and you can't make it happen. It seems to strike unplayed sims who spawn as joggers, might only happen in blizzard conditions, and something has to happen to them to delay them (striking up a conversation, shoveling snow, doing pushups/situps) before they exit the zone or enter a building. I am having a hard time making it happen 'on demand', vanilla or modded. It might just be pure luck and rare having a sim freeze - but that is what kicks off the chain reaction of the observers then freezing when they run out to witness the death. I think that's the real problem atm. It's hard to make that first jogger freeze - which is likely intentional, but once that first one does things go nuts.