It’s the way the rule is interpreted. The hook & hold call @ Illinois was legit. Davison locked in on Cockburns arm and held him on a rebound. The call yesterday was on a fast break. Totally different situation. It can also be called on a pick but that should be a offensive foul anyway so not as subjective. Dirty play no, but like in football or any sport you push the envelope how much you can get away with.
As to Gard, while the focus was on Davison my sense is his frustration spilled over with the calls on Trice and Davis.