Standard procedure to deal with someone that seems like a troll

There is a user I do not wish to mention to prevent a witch Hunt or if I am wrong. In the past two days I have seen them post two topics with fairly contentious topics, but nothing was wrong with the topic itself. The user however, has a flame bait sentence in each of these posts, ex. "I am against homosexual marriage". He then waits for a few heated responses and then edits out the flame bait sentence.

This makes it look like an innocuous post is suddently full of hot heads immediately starting fights based off their assumptions and not what the user posted.

How do we deal with what seems like a troll that operates like this? I won't be posting on his posts anymore as you shouldn't feed the troll, but he definitely got me the first time and it's unreasonable to expect everyone to always be on the lookout for this.

Edit: to everyone saying I am jumping the gun by accusing him of being a troll. That may very well be, which is why I declined to name the user. Even if it's not intentional, it's causing problems if we want this to be a place for high quality discussion. Messaging @deimos has been suggested as an option and is probably the best choice for now but will not scale. What should be our solution to this issue going forward that scales?