I think I know what the *issue* was. McLellan was telling Hall that he is a preternatural force and to stop doubting himself and get back to play where he is causing events instead of waiting for something to happen. For several games Hall was doubting, which happens to all players, even elite players, and it was obvious he was not being as aggressive and looking for turnovers. He was kind of hanging back and thus not being a threat and not making plays.
Mclellan, I bet was saying something like this and Hall was responding that the checking is too tight, I can't make any plays. you can see the frustration in Halls reaction. But Mclellan probably responds with you have to go out and make the plays. Which you can do.
A good Hall makes good reads, senses an opportunity and jumps on it like a cat. Which not too surprisingly he found a way to do on the very next play. That was classic Hall there sensing that play was there. Great feed to Draisaitl. One of the few really aggressive well timed jump I'd seen from Hall in several games. hall had lost some confidence.
What I like the most though, and was very unlike Eakins is McLellan went to Hall and gave him the gears but then later went back to him and said "are we good, you know I'm just supporting you and helping you be your best" (or something like that haha) But the body language was great. Mclellan holding Halls shoulder and bending over close to his ear like a teacher would.. This act conveys caring. You can see Hall nodding, affirming.
loved it