It is fast forward though. Look at the UP. From 113 to 555. You just need to hold the angel until her regen is expired and then her HP will just fall to zero from your units' attacks.
Btw, any guesses as to what the platinum drop unit will be for the second phase? And I've been wondering, are all the platinum drops from star trials from the previous farm events? If so, does that mean there are no farm revivals, since they just put the farmable units in star trials?