Reflex is anything that is "hurled," such as lasers or fireballs, where you have time to react to it.
It makes the same amount of sense a lot of other 4e powers, and I don't mean that as a put down. Take the Fighter's iconic Come and Get It: in its most updated form, a fighter somehow makes a Will attack with a weapon to make enemies come to him or her, and then smacks them in the face with the weapon.Besides it not making sense?
The power sucks as written,
...if I were you I'd feel free to fix it up a bit.
It does more base damage than almost any other 1st level Warlock Daily, and getting to attack with a minor action doesn't suck.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.