Apparently there were more than a few typos in the original Class Acts: Ranger article. They fixed it and put up a new version. I didnt read the article too close since I dont play well, ever, and when I do its never a ranger (not that I hate them, there are just about a million other characters I wan to play first).
My understanding is that there were a lot of powers that were triggered as immediate actions, and some of them werent too clear on condition duration. I dont know. What matters is that its fixed. Well, except for the graphic at the top of the page, anyway.