Rei's illness.
Just wanted to explain to anyone who meets Rei today what's going on with her - it's not part of Tear's event, but a side effect from missing her LCL baths for two days. I've worked out a premise with the modlies of how it would affect her - basically that it helps to preserve her body, which will begin to suffer without it - and an LCL tank will be coming tomorrow, so it'll only be affecting her today.