He is saying the mob version off occultation is utsusemi style shadows, which it is, while the blu version functions like blink. Blue magic spells are only superficially similar to the mob WS they are based on, the effects/numbers/modifiers/etc. are different.
Rdm really should get a scaling blink 2 (along with fencer trait and many other things), but I doubt it will ever happen at this point.
