So I've spent around the last half hour playing around with borrowed Yu S3 while waiting for EX stages since I'm waiting for free rolls to end to get him myself, and might as well start trying him for actually harder stuff, and among things it seems Thorns2 S2 and S3 don't apply Burn past S3, but DoTs like Thorns1 talent does. I assumed both effects would be tied to the character's position, but apparently Alchemical Units are like their own thing that can't be considered an op for Yu to count. Since I assumed during EP-EX-5 with the pirate shielders that they count facing direction independently, but that they'd also consider Thorns2's position for ally effects. Maybe only I didn't know it, but seemed worth commenting.