On the topic of blindfire, yes, it is the responsibility of the shooter to take into consideration where theyre firing, but IMHO it is also partly the responsiblity of the foe to not "spook" the blindfirer in question. (hope youre with me.)
this happened at one of our games which resulted in a pointblank BB lip...gorey i know.
person A is shooting behind cover, ducks back.
person B on opposite team from person A runs up adjacent to person A and hides behind the same cover on opposite side.
person A and person B both unveil themselves at the same time, person A being spooked unloads BB death on person B.
Person A is at fault IMO, BUT! There could have been a different outcome if person B used more of their perception to judge..hey, theres someone there, let's NOT put my face 4 inches infront of his sights and give him a heart attack
here is a movie i have uploaded to my dinky FTP to give u a look at what i mean...
(this is a short clip someone took(think it was dman) in the 'city' at our panther field. - it could have been gruesome if the guy didnt turn around and look teh other way)