R' Korf was asked by these bochrim to teach them tanya, he didnt go out and trick them into learning. He was actually set up to get "caught" in the instance mentioned in the paper
as for slitting the throat - from what i understand - and i heard the story from the wife and daughters,
is that his beard was violently cut off leaving lacerations to his neck - but life threatening ones. similiar to the throat being cut. and he was left on the street.
his family went out searching for him, otherwise.....
his former students who respected and admired him went to find the truth of what happened, and ended up learning tanya - apparently a capitol crime
in any case, why is this discussion needed? the relationship between chabad and satmar are different now. its not the best, but something like this would not happen again.
and punk farkert, there are many cases of Satmar helping Chabad and vice versa.
i mentioned "there is history" to understand the context of why we were getting defensive about the parade ban instead of just attributing it to regular Satmar behavior against "outside influences" , but doesn't mean we need to dredge up all the history and rehash it.