So this party actually HAS a Minion Master, but having that as well as two Tanks, and NONE of them can pull the aggro away from that one attacker?
I call bullshit.
If anything the skeletons should be absorbing most of the aggro between them by sheer weight of numbers.
I don't know what the hell kind of system this is where having 2 tanks could be considered a good thing, but given the MM's task usually focuses on drawing aggro to disposable targets, it makes them doubly redundant here.
AND YET we're supposed to believe that one bloke with a sword can pull all the aggro away from all of them? Just how much damage can he do alone to pull all that?
I suspect the story is just really badly written.