Portals

Okay.
Assume portals, as per the video game Portal, exist and are possible, etc. etc.

If you created one portal on, say, the floor, then another one directly above, you could theoretically fall endlessly.

Given this, would a human continually falling be at terminal velocity until starvation/death from stress?

Assume the portals have been made on linoleum dining room floor and a stucco ceiling. Would it be possible for the subject to move outside the portal to stop? If so, would the impact upon landing be enough to kill them?

I think your movement through the portals would draw air through as well, creating a sort of suction effect as air continued to rush in the bottom portal and out the other. I'm not sure how the math behind this would work, but it seems as the velocity of the air rushing through increased, it would decrease your velocity relative to the air thus increasing your terminal velocity. This would, in turn, increase the velocity of the air rushing through, I believe creating some infinite geometric series. So I guess you'd fall considerably faster than your normal terminal velocity, meaning no, it wouldn't really be safe to even touch the edges of said portal as you fell. Although this is all assuming you can control your fall enough to keep hitting the bottom portal, which isn't as easy as it sounds.