Halo 3 question mostly about screen shots?

[anything I want it to be!]

I was playing one day and I got a triple kill with one sniper bullet and one of the guys had invisibility on and so I went to the video and tried to get a screen shot of it.
For some odd reason it didn't let me.
Why is this?

 

[hhornet323]

were you watching the video with friends on live or offline? if so you can only take pictures when you see the film alone.
if no. then if you have 100 pictures you must delete some of them, you can only have 100

 

[Amazing Badger]

note sure just save the game and try again..

After you take the screen shot it uploads to your bungie.net profile.

 

[Rs M]

Make sure you save the whole clip or the match so it will be solid evidence