It seems like the [end users] value may include a CC depending on the scenario (ie. a CC reply-all). If so, it seems like this would mean that a reopen trigger based on [current user][is][end user] could reopen if a CC replies, not just if the requester replies. Is this the case?
If so, is there a separate trigger/method I should be using to affect the equivalent of [current user][is][requester]?