You need two players for it, if you are alone logic he will skip.
Still not a reason for boss to reset if one person is alive.
The boss would use the shield and start AOE who mostly would kill tanks plus most of thanks have no damage to break shield alone on time.
Plus boss would need to still cast the frostbolts on you.
Bruh, what.
on the downstarts while taking the AOE, plus Frostbolts, plus dodge crap, plus a shield to break are you a 226 tank on a +7?
so what ? I’ve solo finished many encounters. There is no reason for boss to retest if one person is still alive
There is no reason to either fail an easy meachaning and 4 people die on that boss.
Bruh, this is all the damage it did over the whole fight before it reset.
You think that’s enough to kill me?
that’s the problem. It shouldn’t. Now this mechanic prevents this boss from being soloable in a later expansion.
Why? for a mechanic that was supposed to be dps specific only? too lazy to code it in a way to ignore tanks altogether?
On a later expansion you will one shot him even before he casts that spell with gear diference.
go and one shot king’s rest. Have fun with the second boss.
A simple “WTB help on kings rest x gold” fixes it.
Plus when expansion ended a lot of mechanics changed to make content soloable.
Plus why would Blizzard nerf the actual content to think about solo people in future?
And that’s why there is an entire achievement based around soloing Plaguefall Heroic/Mythic right now? 
It isn’t about something being meant to do as a group. It’s just mechanics.
Plaguefall was made with solo intention, why you think the skip exists?
? dude i don’t need to tell you why…becuase dungeons were DESIGNED for GROUP CONTENT since the begining of this game if you want solo content spam blizzard with mage tower or visions from BFA that was a good solo content
no you are bad becuase you failed +7 key 
? what achievment? becuase what i can tell that is only a MOUNT and you need to kill only last 2 bosses on HC and thats not challange
What kind of logic is that?
Where does it says that? Oo It is required a tank, 3 DPS and 1 healer… not mandatory
it is simple…when there is no fail there is no RESET on that boss??? 