x1 is a reader/'ghost' to (experiencing or watching, but not being able to influence or interact with/in) events x2, able to experience/access world-internal/event-internal information x3 in addition to any external stimuli which they can directly perceive from the event itself (if they can perceive it), bringing with them their own event-external thoughts/memories/experience/habits which include x4, accessing this experience/event via means x5.
x1 is remembered by someone/something which remembers ... which remembers someone/something which is remembered by x2 via intermediate nodes/steps x3 (ce'o; ordered list).
x1 is conscious, aware, capable of understanding experiences to some degree, and capable of forming new and lasting experiential memories, and has some sense of defined and stable self/identity/personality according to standard x2.