Follower State Not Displaying

The "ring" state for my follower never displays. Its idle, hurt, and lose sprites all display at their appropriate times, but the frame for "ring" never shows, whether I'm grabbing rings or using them. I suspected it may have something to do with the Duration line, but I've tried changing that to no success.

Spoiler: The code, in its entirety

Generated by Followermaker:

FREESLOT
SPR_YTTL
sfx_FHYTTL
S_YTTLIDLE
S_YTTLHURT
S_YTTLLOSE
S_YTTLRING

STATE S_YTTLIDLE
SpriteName = SPR_YTTL
SpriteFrame = A
Duration = -1
Var1 = 0 #no. of sprites (starts...

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