Read the post above. People have more often than you probably know taken over 10 pills in a short period of time. Your friend may have not taken 7 pills at once, more likely throughout a night if it all, but your friend wouldn't necessarily die from 7 pills of MDMA. Unless the ecstasy was adulterated and was not pure MDMA and instead PMA or something else really toxic. Its very hard to die from MDMA. I've seen people eat over a couple grams over the course of a weekend. It may be a bullshit story, but your story is bullshit for suggesting someone would die from 7 pills of MDMA.
And 6 hits of acid is in no way unbelievable as first, there's no way to tell how many micrograms were on each hit. I took 6 hits in (godawful for tourists to get drugs) Wisconsin and barely felt anything. And second, even if they were ridiculously strong hits with 250 micrograms on each hit, you still would be alive to type that you ate 7 of them as it would take an unfathomable amount of individual hits of blotter acid to die.
Another bullshit story:
"Double stacked" pills
"Triple stacked" pills
Now pay triple the price bitches! haha