A while back (I believe it was with Hurricane Matthew), I read about about a system that was actually creating shear, leading to a favorable interaction with the hurricane because it was allowing the storm more outflow, despite it technically being sheer.
I was wondering if this is what you meant. A system close enough to interreacting, is actually creating a channel for outflow for Henri.
There was a specific name in a study for this, but I cannot remember it off the top of my head.