That's a pretty cool tool right there. But who lifts up the log and puts it in there?
If the chainsaw is binding youre cutting wrong side. Some cuts you think gravity is helping pull the branch down and open to not bind, but in actuality, its binding and bending back up because it got wedged and is leveraged by another branch bowing it back up. Some cuts you do over the top and some underneath depending on how the branch or limb is bending. If its a log laying on ground, make your normal one foot cuts but only go halfway or 3/4s. Then kick or roll the log forward and slice it up on same lines. I like to grab one of my previous logs and throw it under the bigger log. Once you cut it it's already up in the air on the little one. Then work your way back. Its kinda like chess or playing pool, You have to preplan your cuts for the next shot so youre not backing yourself into a corner and or lifting logs, bad on the back. hah.
Northern Tool has a prybar handle tool with a hinged pointed hook on it and bent backside. You just put the hook on one side and when you pull back on the handle, the pointy caw digs into the backside of the log and leverages it up onto the bend raising the log off ground. Kinda works like Channel Locks. And log ends up being about 4-5" off ground. Enough to get a clean slice off without dipping your chain into the dirt/sand on accident. Works great, and you don't have to pre position logs under the big one you are cutting. Just work your way down the fallen trunk with the tool lifting every three feet or so. I forget what the thing is called, but it works awesome.