I noticed on my last two rides that if I am following a rider, back about a dozen bike lengths or more, while coming down the mountain, that the rider will catch some fairly good air going over the last hump near the base. Tried to snap a pic but it all happens to quick. Zwift is addictive! Never really ever looked forward trainer rides (30 years of agony) now I look forward to rainy, snowy, windy, or any other excuse days.
I’ve noticed the same phenomenon. Bizarro!