3 iirc.
Though when i played tsubaki, i was more concerned with you naked grabbing me and everytime i went for barrier IB, i got grabbed instead.
With hazama, i just IBed without the barrier and reacted to grabs.
I would think Tsubaki (the move) would be less safe than hotaru though.
So i guess even with IB, i should be more careful because her 5a range isn't the best and i'd have to dash in a bit.