PV question

[BigAyuFan]

i have a few questions about Ayus pvs that i just dont get.so i made this thread for the people to ask questions about things in pvs they dont understand.

so my questions r in Rainbow and Fly high
Rainbow:im not getting y shes running from her self and at the end y did she disappear??was she not there and imagine all of that or something??
Fly High:y is there 2 Ayus in this pv too??in part of it y is the one not singing on stage??

if someone could help me figure out these things thanks and anyone feel free to ask more pv questions