Yeah, that’s a nasty downdraft but I can see why they pulled the tornado trigger. The rotation enchanted/tightened up as that trailing squall line caught up to the leading one on the southern edge of it.
Watching the radar loop of this and that trailing line was hauling ass that it caught up to the lead line just as it was hitting the cape. Probably lent to some low level circulation. Fascinating stuff to watch unfold.