Honestly deflect has been only good for trolling and I think a mastery would be good for it. Good deflect player are the people who would enjoy this the most.
Requires you to use both the E and Q ability over 945 times, needs to bump people away (Progress saves when you die)
Mastery upgrades
E ability: Deflection hotspot
Summons a deflection box that you can enter while nothing else can (Cd 20 seconds)
Q ability: Deflection overload
After hitting 5 people, you can use deflection on yourself to fly for 10 seconds (Cd 30 seconds)
R ability: Absolute zero (Cannot throw people into the void)
Like magnets mastery, you can turn this on and nobody can hit you. It grants you the power to grab people, but it disables your barrier. When grabbing somebody, you can fling, slam, lock, and spin them around. (Cd~ 10 seconds) (Requires 5 uses of the E Ability.)