I’m not basing this on any sort of BTS info, but from the moment I heard the TLJ score I’ve suspected that Williams went back to the ol’ “Rite of Spring” well for the Finn vs. Phasma fight.
Williams:
http://www.youtube.com/watch?v=lOXXNLKVA90&t=1m20s
Stravinsky (quicker tempo, I know, but perhaps they slowed it down for the temp):
https://www.youtube.com/watch?v=6HVF40mWIlM