Demon1 can't blast pack.
One of the common misconceptions about duelist is that if you can play one, you can play all. The issue with duelist, Raze in particular, is that each one brings a different style. Raze's style of duelist is aim minimalistic. She has a boom bot, a grenade, a blast pack and an ultimate that requires minimal aim. This is in contrast to an aim-centric agent where the abilities directly tie in to the player's ability to aim (Jett knives etc... oh and the highest aim ceiling ultimate, deadlock ult) While we often see high-caliber players pop off on this agent. I think this causes some confusion among the community that it's some how attributed to the agent and not the player.
So why is Demon1 bad at Raze? He tries to play Raze as an aim-centric duelist. If you go back to the last time NRG played Sunset (vs LOUD). Every single blast pack was in the clear and never challenged. This allowed him to push up and basically ignore the fact he was on Raze. He did use blast pack at times to escape but the double blast pack sort of flying through the air, a cornerstone to most Raze players, is absent in his game.
If you still don't believe me, in his game vs LEV (sunset), this was his blast pack usage:
r1 - aggro blast pack
r2 - no blast pack use
r3 - blast pack into b, challenged, dies
r4 - blast pack into b, challenged, dies
r5 - no blast pack use
r6 -blast pack to clear no opp, blast pack ult no opp
r7 - escape / push, no opp
r8 - double blast pack, challenged, dies
r9 - blast pack in b, challenged, dies
r10 - no blast pack use
r11 - no blast pack use
r12 - no blast pack use
r13 - no blast pack use
r14 - no blast pack use
r15 - no blast pack use
r16 - no blast pack use
r17 - no blast pack use
Unfortunately NRG's coaching staff doesn't know their players.