OOC: Pinned down?
It's still dark, you have no light, the guy's hidden in the underbrush. So yes, concealment would apply. Marksman doesn't apply since you had to move and dodge, but if you remain there, it would apply.
Judging from the noise, they are close by, within your normal pace.
No specific orders, Konnikov ordered a search
Attacking with the rifle butt would be a Fighting attack, you could make it non-lethal, too.