I met Allan only once, about which more in a moment. I saw him perform several times. He was an astonishingly magnetic performer, able to hold an audience (and me) with the barest of things, like when he played a harmonium and chanted (in all sorts of rhythms) the word "generosity" over and over again for maybe 3/4 of an hour.
He came back from something with my grad school roommate, with whom I imagine he might have had a wee fling. The minute he saw me he lit into me, railing against something or other that he perceived. Somehow, I didn't take it personally or develop a dislike for him in turn, though it didn't enhance my view of the man himself. I was just sitting there, on the floor, studying when they came in. Soon after, they both left.
Now that I think about it, his aversion to me reminds me of the instant aversion some of my customer service customers took to me, while others asked for me specifically. Can't explain chemistry. He lived large, appeared to have enough extraversion for thousands, his friends were loyal throughout his and their lives (so he must have been loyal), and he was faithful to the Tibetan Buddhist practice he adopted mid-life. Much to admire.