The answer is simple ... he wanted to try and pick the ball up and make a play on 3rd down, not dive on it.
Cam is in a perfect position and distance to dive on the ball ... if he wanted to do that.
Here, as he starts to reach down, ware puts his arm out and now Cam is too close and his leg is too stiff to now dive down ...
https://www.google.com/url?sa=i&rct=...55204225776955
^^ here is a link to a GIF of the play. More clearly shows Cam approaching the ball with the intent to scoop it up ...