First clear the groups of royal guards from around the fountain - there will three groups, each group with one 65^^^ and three 65^^s
When they drop, phalanxes of royal guards will spawn in front of the two staircases. Like the fountain, each group will have one 65^^^ three 65^^s, but the groups will be very close together - consider body pulling and retreating to a safe distance
After all these are cleared, the royal guards around the fountain should repop. Alrendi should be among the four in front of the fountain. If he isn't, clear the royal guards and try again.