I feel for you, but I soo lol'd when me and my team did this to another team on Wayont I believe, I went into the theatre to see the carnage up close and sure enough - In Big Team Battle if enough people are shooting you then it is indeed a 1 second death,
etc. 7 people fire exact same time = 7 shots/your dead.
Suggestion whenever coming into contact with an enemy always use a barrier or cover to shield yourself from the majority of enemies leaving the duel down to you and him. It's never nice to have to fight 2 at once so increase your odds.
Also if 2 people shoot your full spam then in essense you would die twice as fast as 1 person pulling full spam.