If you listen to the start of the FLIGHT loop of the Kranz shift just prior to the accident, then go all the way to the end, you'll notice there is discussion about how to manage the SHe problem on board the LM, in case the pressures are too high. It even gets to the point where Kranz has a meeting with the LM guys and some folks in SPAN on what steps need to be taken if the SHe pressures are too high, requiring the AFD to take over in the interim.
By the time Kranz returns, Haise has already entered the LM and has reported a nominal SHe pressure.
EECOM Sy Liebergot laughs about the amount of time and effort that went into creating a plan, and how it all turned out to be for nothing. The sense of relief and elation throughout the MOCR (at one point requiring Kranz to bark at the controllers to "keep the chatter down") is especially ironic given what happens an hour later.
Link:
https://apolloinrealtime.org/13/?t=054:52:55&ch=16