No need for a second arrow. They only have one life after all.
[CONT](RC)/(GC):If your opponent's G zone has a card, this unit gets [Power] +5000/[Shield] +5000. If your opponent's G zone has a face up card, it gets [Power] +10000/[Shield] +10000 instead of [Power] +5000/[Shield] +5000. (Active on opponent's turn too)