It looked like they had a leak from one of the propellant tanks on the Lunar Module.  If so, that meant abort!  Apollo TLI ProfileParticles around the LMSIV-B Separation

“Unlike the roller-coaster ride of Earth orbit, we are entering a slow-motion domain where time and distance seem to have more meaning than speed.” Mike Collins  Departing EarthTrans-LunarNearing the Moon