If you meant Lae´zel, Githyanki has a racial psionic ability called "jump", amongst others, that allows you to ...er... jump farther, longer.
http://dnd5e.wikidot.com/githIn other gameplay some mages are using the spell "misty step" that teleports you farther away, or "feather fall" or "jump" spells.
I'm thinking more about Astarion during the Pax East that disengage a fight jumping far away from it's opponent. I think he also jump during the fire trap sequence but I have to check.
I also think about the custom character Sven played during, if I remember well the second gameplay presentation.
I'll try to find video exemples when back at home.
