There are to ways to resolve a problem in a game with out an arbitrary roll off. You can approach the game as an adventure and fun or as a math problem and a law school exercise. Take Line of sight you can get out a periscope and a laser pointer or you can make an extra in the way test. Some people play a game for fun some people play a system.
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As I say, when they're behind cover, and all your bows concentrate fire on them, that seems like abuse of the rules to me.
That is certainly a legalistic mathematical approach. It is a bit like card counting.You can expect it when you are playing for money.This is supposed to be for fun.
Look at it this way why is the hero cowering in the back? To quote a confederate veteran in the Spanish American War. "Haven't had a horse shot out from under me in 30 years it is still a thrill"
On the other hand, if you know the guy is going to approach the game this way, bait him. Put a nice juicy hero in the back for him to concentrate on and run the archers down with a CV screen. That is what they are there for after all.