Quote Originally Posted by LoRdofCookIES View Post
Meaning that this mini explosion happened at: 1. at the side of the entrance 2. at the team Evil side 3. the OotS side. Yes. Three sides. Magic! Or rather, suspension of active teleportation magic.
That would explain the scorch mark on panel 18, but would render panels 9 and 14 wrong. On those, by your explanation, there shouldn't be half marks. They had to be on both sides.

I still think it's as simple as an art error on panel 18. Occam's razor.