I've read a whole book about parachuting accidents. Yeah, many people have survived when their chutes didnt open at all. Terminal velocity is ~120mph for a man, so its not that unbelivable. Pine trees are very good for landing in. While I havent seen anyone actually fall into a pine tree before, I have seen many balsa-wood r/c airplanes fly into pine trees and not have a scratch on them.
Heres some notable cases- Lancaster tail gunner falls 20,000 feet after he starts to burn up and he falls into a pine tree and 18 inches of snow. He breaks his pelvis and spends the rest of the war as a POW.
1950s fighter pilot bails out, ejection seat fails to seperate from him, he hits ground (amputates both legs) but survives.
A navy seal was doing a c-130 rope extraction (where a c-130 picks up a seal by flying low over the ground and snagging a rope attached to a seal). Anways, the seal gets picked up, and the c-130 flys out over the ocean. The rope breaks, so the seal angles his body at 45 degrees and stiffens up. The force of the impact of the water was said to have cut the Seal in half.