Spells: Rapture/Glamour not interacting correctly

[Raev]

I have some enchantering shenanigans in mind and I wanted to see if I could overwrite Rapture with Glamour of Kintaz, which would obviously be kind of useful.

[Mon Jul 02 20:09:44 2018] You begin casting Rapture.
[Mon Jul 02 20:09:46 2018] Froglok ilis shaman swoons in raptured bliss.
[Mon Jul 02 20:09:48 2018] You are enveloped in a swirling maelstrom.
[Mon Jul 02 20:09:49 2018] You begin casting Glamour of Kintaz.
[Mon Jul 02 20:09:51 2018] Froglok ilis shaman has been mesmerized by the Glamour of Kintaz.

So far so good.

[Mon Jul 02 20:10:07 2018] It will take you about 30 seconds to prepare your camp.
[Mon Jul 02 20:10:11 2018] It will take about 25 more seconds to prepare your camp.
[Mon Jul 02 20:10:14 2018] Your Rapture spell has worn off.
[Mon Jul 02 20:10:16 2018] Froglok ilis shaman tries to hit YOU, but YOUR magical skin absorbs the blow!

Well.

So either Glamour should overwrite Rapture and isn't, or it should give the 'did not take hold' message and isn't.