Rek'Sai comments and questions?

So some comments and questions I didn't get to ask during the Q&A perhaps community can answer for me.

1. They said earliar that Rek'sai's tunnels will be able to be destroyed by standing on them for a short amount of time this said. i have 2 issues/questions with that, 1st being if she ults a tunnel and they are standing/about to or are destroying the tunnel will she stop mid ult? or fly all the way through?
2. if you close off one part of a tunnel shouldn't the other end still remain open i mean its not a cave in? so if so can you step on one part of a tunnel leaving the other whole still open for her to ult too? wouldn't this be a good balanced for her ultimate since it can be very difficult to sustain tunnels in first place?
3. how will Rek'Sai as a jg relying sole on strong entry during ganks. How will she do proper damage? with her E being her engager her W being her burrow and her Q being the majority of her damage being AP based will she be an AP or AD champ with no slow how will her damage output end up? its a confusing scale @.@

p.s. they should totally add a bonus sale to weekly sales 3 champs/ 3 skins/ 1 legacy skin for sale per sale