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 according to standard x2.