Although this may sound very defensive, it is not meat as such, but rather as a clarification. I am typically arrive 10 minutes before mass and typically stay till the last note has been sung. This is a very unusual situation for me and I agree its not right, that it is rude, that it should not be done, etc. Nonetheless, this time I failed and left just as communion was being distributed (I was not in a position to receive) and had no good reason to leave. I have now confessed the underlying sins that caused me not to receive and am just trying to assess whether I also need to confess not fulfilling Sunday obligation because of my early exit (I did not do so yet).