I'd like to re-iterate many comments about this show already made; great show and it held me enthralled throughout the entire episode. I had a few critically minded questions...points that stood out that had me wondering;
Mr. Shrum was able to fire off 3 shots from a 60# draw compound(?) bow while perched precariously up in a tree. Those of us who have fired a bow with such a draw know you need quite a bit of leverage and balance to do so, which would indicate either Mr. Shrum is a fantastic shot (he confirms he struck the suited/robot entity at least once of his 3 shots) or the tree had some really thick branches he was able to brace against or upon.
Another point I'd like to make is in Gene's comment, and another reference posted on this forum, that the aliens appear to be pretty low-tech. They had no 'ray' gun or advanced weaponry and were apparently incapable of pulling down a tree'd human (LOL.....I laugh every time I think of that, no disrespect to Mr. Shrum,) but I've always felt like aliens/visitor/whatever you want to call them may not be very sophisticated in weapons at all. Bottom line is they may not be a militant or violent race and have never developed the need to create technology to harm others. Even the vapor-gas employed against Mr. Shrum may have been more of an improvised tool they used in attempt to capture him. Since they are alien, by nature we do not understand their technological development. Their mode of transportation could be infinitely more developed than ours but their weapons or defense technology may be very rudimentary or non-existent. It was mentioned on the show by Noe that he got the impression by the behavior of the entities that Mr. Shrum's discovery was accidental, and that the humanoids may have been there for other purposes. I liken it to this metaphor; you're a biologist on the African Sarangetti trying to get a sample of a rare form of grass. You take with you only what you need...tools to gather samples, maybe some small sampling devices, etc...when you look over and see a male lion watching you from a distance of about 30 feet. Uh oh. The same thoughts flying through your head in considering this scenario may have been what the aliens where thinking when they saw Mr. Shrum, perhaps. The whole "attack" against him may have been solely for the purposes of subduing him so he didn't panic and cause harm either to the aliens themselves nor himself.
Of course that last paragraph is speculation, but thought I would throw it out there for entertainment and consideration value.
Two-pennies provided.
J.