I just saw someone point out the Bo-bo-Boom sfx. From my understanding of the panel, first it's one attack not three going by the impact star or whatever it's called on Zoro, and second Zoro tried to parry Imu's attack at the last moment but he got overpowered. One "Bo" going through his first sword, the second "Bo" going through his second sword, and the final "Boom" for the impact on his head.
I seriously can't decide if this better showing or worse, to actually get overpowered by a small flame bullet going through his haki sword defence, or just straight forward headshot that he didn't react to.
Now I'm scared for Sanji. If a small Omen is this strong to overpower Zoro, then how strong is a WMD scale Omen explosion that Sanji just ate.