The reason Newt was able to handle dragons so well during the war was because he had a common trait with them. The dragons recognized Newt's affinity with fire and claimed him as their own.
During Grindelwald's trial (or after his escape) he attacks MACUSA, and Newt neutralizes him with his ability, or just anything with Newt being BAMF with fire.
Bonus: Newt's an absolute beast with fiendfyre, he can handle it easily.
Bonus x2: Newt doesn't even need a wand for fire related spells (fire elemental??)
Fire Affinity/Elemental - Newt, Fiendfyre, and Dragons (Gen or Graves/Newt)
During Grindelwald's trial (or after his escape) he attacks MACUSA, and Newt neutralizes him with his ability, or just anything with Newt being BAMF with fire.
Bonus: Newt's an absolute beast with fiendfyre, he can handle it easily.
Bonus x2: Newt doesn't even need a wand for fire related spells (fire elemental??)
Bonus x3: Newt's ability is super rare.
(Yes, I'm full of clichés)