YES, SPOILER ALERT - SERIOUSLY, A DEFINITE SPOILER ALERT !!!
A glyph of repulsion combined with a glyph of paralysis can turn a group of enemies into a cluster of sitting ducks.
A Rogue might actually be able to detect that a glyph of paralysis is a -magical- trap; and it can be disabled as one.
Upon my quest on finding Jarvia, I'm in the Carta hideout where a group of casteless are waiting centered around a paralysis glyph. My Rogue stealths in a disables it. She backs up a bit and targets a dwarf with a scattershot. As she draws back on her bowstring, Wynne casts a repulsion qlyph on the obfuscated rogue, so she may be safeguarded from melee attacks once stealth is broken.
Now, oddly enough, the paralysis glyph was disabled and dissolved into nothingness; Wynne's repulsion glyph touches the rim of where magical trap used to be -and, it triggers a paralysis explosion. What???
In my line of logic, that should not have been possible. Disabling the glyph, my party members can no longer suffer its constraining effects; and yet, the combined effect can still be triggered.
So, is that a bug, an oversight, or the limitations of the game or how these enemy glyphs -the ones that are already in place when you stumble across them (they are not cast by an enemy mage during battle)- are implemented?