As per the second bullet under 3.0 of the V5 rules, all units in terrain with hexside such as hedge substract two (-2) (if any/all enemy fire would cross the hedge hexside. Here is the situation: Should the German medic get the the rallying bonus because all fire at him from the British units would have to go through some hedge, even though those attacks would actually be impossible, the British units not having LOS? If the answer is no, it seems strange that if a unit has LOS to you through a hedge, you get the rallying bonus but not if said unit does not have LOS to you because of said hedge. The second situaiton seems safer to me. But if the answer is yes, it opens the question as to why a unit standing beside a building in the open but out of LOS of any enemy unit because of said building (or even other terrain feature) should not get the rallying bonus.