Can Gnar jump multiple times?
Solution 1:
Gnar can only gain 1 extra jump from his E when landing on a unit. Please note that only minions, monsters, pets and champions count as units. Turrets, Wards and similar objects like Jarvans Flag don't work.
If you bounce off it's basically the same spell just applied a second time. You have the same range and the same damage as your initial cast.