Catch Throw
These are throws with special start-up animations such as Goh’s [6][6][P][+][G], Sarah's Flamingo Stance throws, El Blaze's Rocket Discharge throw, to name a few. Catch Throws are designated on the
VFDC Command Lists as “HCT” (High Catch Throw) in the “Cls” (Class) column.
Depending on the character they have varying execution times and ranges. All Catch Throws are inescapable except for the two Defensive Move Catch Throws ([P]+[K] during Defensive Move with either Wolf or Vanessa in Offensive Stance) that can be escaped in the same manner as Side Throws.
Catch Throws have the ability to beat (or
eat) an attack where a Normal Throw would otherwise fail.
Specifically, so long as the attack has not yet reached it's hit frames, and is on the same level (standing or crouching), then the Catch Throw will connect successfully. Compare this to a Normal Throw that will fail against any attack that's already executing.
http://virtuafighter.com/wiki/vf5/system_part_2#catch_throw