Angel Hernandez is just a bad umpire who doesn't know the rules but thinks he does. This is not situational.
NHL refs are good refs but have been told to keep games close.
Check out this research paper.
http://people.stat.sfu.ca/~tim/papers/penalty.pdf
Quote:
Two of the primary observations in this paper are that (1) teams that have taken more penalties in a match are less likely to have the next penalty called against them and (2) teams that are leading in a match are more likely to have the next penalty called against them
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