Because from everything I know on the subject it's absolutely not possible.
I'm actually interested in this, handheld response time isn't something I know much about, just heard it can be extremely low (which checks out from personal experience). Can't seem to find any sources testing lag on earlier handhelds, which would be neat to see. Haven't played blossom tale myself, but that video looks legit, so I don't see how we can't accept it. If you've got any sources on the issue, I'd be interested.
edit: Interesting that OP says BT "barely beats SMO" which obviously has well over 2 frames of input lag. I took OP at his word that it was really 1 frame for BT, but since there's no frame data from the camera displayed in the video, that's hard to confirm. I wonder if OP's method of counting frame delay is off a bit. Perhaps BT is closer to 2 frames and HK is closer to 5? Anyway, would be nice to get clarification from OP.
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