How do Eldar feel when they meet powerful human psykers? Obviously all Eldar are psykers and only some humans are, but among humans the range is much greater. There is that one excerpt where a group of Harlequin are struck dumb with awe and fear when encountering the emperor's psychic presence in the warp and realize he's holding back all 4 chaos gods at the same time as an example. What about a random Eldar meeting an Alpha Plus psyker?