When a comment gets a certain number of flags, the [flagged] marker appears on the comment. When it gets an additional number of flags, the comment becomes killed and the [dead] marker also appears.
If a reader does not have 'showdead' turned on in their profile, or is logged out, then the text of [dead] comments is not displayed. Instead it will show as either [flagged] or [dead]. This is what happened with your comment when it was in the [flagged][dead] state. Had you viewed it with 'showdead' turned on in your profile, you would have seen that the comment was still readable and not deleted.
Once I unkilled it, it went back from [flagged][dead] to just [flagged], and it went back to being visible to everyone whether they are logged in or not, or have 'showdead' turned on or not.
If you're logged in and seeing some comments that just say [flagged] instead of text, this is because you haven't yet turned on 'showdead' in your profile.
If a reader does not have 'showdead' turned on in their profile, or is logged out, then the text of [dead] comments is not displayed. Instead it will show as either [flagged] or [dead]. This is what happened with your comment when it was in the [flagged][dead] state. Had you viewed it with 'showdead' turned on in your profile, you would have seen that the comment was still readable and not deleted.
Once I unkilled it, it went back from [flagged][dead] to just [flagged], and it went back to being visible to everyone whether they are logged in or not, or have 'showdead' turned on or not.
If you're logged in and seeing some comments that just say [flagged] instead of text, this is because you haven't yet turned on 'showdead' in your profile.