OK, so if the +5 THP resets, then Rain will be 41 +5 THP out of 43 HP's with 5 Healing Surges remaining, so she'll be fine.
Zuri is currently 26 out of 34 HP's, so she'll spend a second surge (leaving her with 4 surges remaining) to bring her up to 34 out of 34 Hit Points, with the +5 THP...