I believe 100% this Is why he spooked.

Jeff, I've had deer spook from accidentally leaving my light at the bottom of my tree. I've also had bear spot an arrow that I had also previously accidentally dropped from my stand and a bear's eye sight sucks. Anything that's not the norm they will notice In a heart beat. Ever cleared brush for shooting lanes and threw It In a pile where a deer might see It? Same thing will happen being It wasn't there before (looks out of place). I've been careless and have forgotten to hide branches from trimming, It cost me a doe one year.