It really is confusing, because there are actually two different responses made by the MPD about whether the perp was seen or not after the attack. We talked about this a lot at the beginning of this thread, in fact (see page 5). In the first presser - the day of her murder - Spann seemed to say perp was seen "walking down the hallway" and said that presumably SP left the same way he entered. But in the same breath he admitted they weren't actually sure of the point of exit--there was "no evidence." Then later on there were firm MPD statements that 1) there was no video of the attack or any interaction between MB and SP, and 2) there was no video of SP after the attack. In 30 threads we haven't been able to resolve those conflicting statements, except to acknowledge that we are of split opinion concerning if SP was seen going anywhere after the attack.
At the initial 4/18 press conference, as Spann fielded reporters' questions on this, he spoke in incomplete phrases, and said "and again" referencing his previous response -- which was that they were still putting together and trying to order all the footage they'd just gotten hold of that same day. So, just my take (expressed on page 5 of this thread), but it's possible Spann wasn't as sure on the day of her murder as he is now concerning whether or not there is footage of SP after the attack. IOW, (my interpretation), answering that SP was seen walking the hallway, but due to still ordering the clips, couldn't be sure if that was before or after the murder, nor was there any "evidence" as to his exit (only a presumption).
If you study the highlighted portion in the screenshot below of the 4/18 press conference transcription by WS member Galadriel, you can see Spann's answers in context to the media questions. To me it appeared to be a very speculative response (which was understandable for the day of the murder). So in the end, until we're told the confirming facts, it appears to boil down to personal opinion on how each of us wants to reconcile the conflicting statements:
Source:
http://www.websleuths.com/forums/attachment.php?attachmentid=95546&d=1464467808