Because the version of the video last night was different. It showed the entry about five different times and only on the last iteration could you clearly hear the announcement.
The version on there now doesn't look to be edited or altered. However, it is incomplete compared to other information. This video is apparently from the helmet camera of one of the SWAT officers. We know the wife said she saw one of the officers from her bedroom window, and that the officer saw her. The helmet camera doesn't show that. There is also an audiotape released in which one reporter says officers tried for 30 minutes to get the occupants to come out.
My guess is regular officers initially served the warrant and only called SWAT at the end. But we should wait for all the facts available before jumping to conclusions.
That was after shots were fired. (You have to put together multiple articles from KOLD.) See my post above...