This is more of a scene breakdown, so to play it safe..
**Spoilers**
I've seen the movie twice, im almost 99% sure that he only had the flashlight in his hand. He saw the Predator, was like what the hell, hid behind the tree, while peaking around the corner his radio went off. Predator saw him, then went cloaked. I do not recall any weapon being drawn during the chase.
** End Spoilers**