Siberian Wilderness - Defeating the Trinity Scouting Party (Part 1)

Start down the hill, sticking to the left path at first. When Lara hears an enemy, she'll go into a defensive crouch. That's your cue to move into one of the bushes alongside the path for concealment.

Watch as the man moves across the path to the left. Notice how he glows in yellow in Survival Instinct. This means killing him will not alert his friends, provided you do it quickly and quietly. If you kill an enemy highlighted in red, others will notice even if it's a stealth kill.

Scramble up into the tree on the right side of the path.

Leap forward to grab the next branch, swing, and jump onto the broken branch ahead.

Then watch as the man below examines his comrade, who has fallen victim to a trap set up by the natives. When you see the Melee Icon above his head...

...press Y/F to jump down on top of him.

Wait for the second prompt and press Y/F again...

...to finish him off. Then loot his body to complete the Grab and Go Challenge.