The memory Eren will see is this time from someone else's point of view. The same potion seller from before, accompanied by a guy the same age (the memory owner). Just as an explosion erupted in an unknown place (it could be Summer Segment, it could be anywhere else, it's hard to say) the potion seller drank a potion that formed a barrier around his friend. After the explosion passes, the guy will note that the potion seller is indeed dead with his soul leaving his body.

Words "You used the-- You idiot. Why. What will I do without you?" can be heard in the memory as the memory ends.