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Mulligan has finished shaving, and has lost the skirmish with Stephen, so he heads back downstairs. In telling Stephen to quit his “moody brooding,” he triggers in Stephen’s mind a memory of the days at the end of his mother’s life. Instead of praying with his mother at the time of her death, Stephen sings the W. B. Yeats poem “Who Goes with Fergus.” The line from that poem “And no more turn aside and brood.” occurs to him all day.
“Chuck Loyola” is notthe name of another friend, but is rather Mulligan’s request to Stephen to leave behind his Jesuitical rigidity (the Jesuit order was founded by St. Ignatius of Loyola) and get over it.
“Sassenach” is a Scots word for Englishman–it’s derived from the word “saxon.”