Everything

A failed teleportation roll simply fizzles; the mage goes nowhere. A botched roll, however, has far worse consequences.

Consider a botched roll while using Correspondence teleportation to be an immediate physical Paradox backlash, as described under Physical Backlash, aka “the Burn” (Mage 20, Chapter Ten, pp. 551-552). Story-wise, the mage manifests inside a space that’s already occupied by something (or someone) else. A small amount of bashing damage reflects a “bump” between those competing physical objects. Lethal damage reflects a severe “crash,” and aggravated damage manifests the traveler inside of an unfortunate object or character, who probably takes that damage as well! In all cases, the Paradox Flaw represents skewed perceptions that got hammered by being in the same location as something else. For an appropriate length of time, the rattled teleporter will be adding a +3 modifier onto her spotting difficulties (see above), and may suffer nightmares or phobias related to her teleportation accident.