McCoy shakes his head a little. "Sorry but this is doin' my head in. Doors to other universes that pop up outta nowhere, living tattoos, some kinda... transdimensional communicators..."

"Is it really that much stranger than time travel through artificial black holes?" Jim points out. "Not to mention the part where I'm not dead right now."

McCoy visibly flinches, and he folds his arms across his chest defensively, uncomfortable. "That's a low blow, Jim."

"But still true," Jim answers. "I don't get how it works either. But it is real."