"Sweet Child" is a slightly odd choice, though IMHO:
It's still very much Blessed By The Gods Of Rock, but the pacing and whining wistful tone are ideal for a slower, more reflective trailer.
As m'learned coll' @InvaderStych says, it's very much "where do we go now..."
The song choice does imply our favourite 80s throwback Avenger isn't searching for something so much as... someone.
But she's very much a new model someone. I don't know if you've been in that situation where someone tries to come back to a relationship after absence, where one has gone through a major change (on either side). But someone just trying to pick up where they left off and expecting it to all go the same... does not choose wisely.
Learning to set aside what you had and embrace the new is a Major Learning Process for anyone, let alone our overconfident blonde lummox...
...even moreso when she's just taken his gig and looking damn fine doing it.
Another lyric is "I'd hate to look into those eyes and see an ounce of pain". There's a lot of things this could refer to, not least...