I've written a blog post looking how the Abe Store in Sakuragaoka used to look, in the development days before Shenmue's release.

https://i.imgur.com/HXdyjPDl.jpg

Did you know the Abe Store in Sakuragaoka was originally going to be called the "Saitō Store"? We look at this and other ways the store was adjusted before Shenmue's release.
Article:
http://www.phantomriverstone.com/2018/07/the-changing-face-of-abe-store-beta-vs.html

the individual kanjis mean - strike, open.
but according to jisho.org when combined it means
だかい - dakai - 'break in the deadlock​'

so maybe this is an indication of a successful counter attack. ie. the opponent grappled Ryo and he successfully executed a strike reversal.
Great theory!
best to wait for the switch translation.
Haha, well you guys have already nailed the meaning of the characters. I did manage to discover a couple more links with Bajiquan which you may find interesting. The research took longer than I expected, there wasn't a lot of easily-available information on it.

Link to post: http://www.phantomriverstone.com/2018/07/examining-warehouse-battle-scene.html
https://i.imgur.com/IYO7mKFl.jpg