Which Fighting Arts Would Batman Realistically Have Done?

I try to decipher which fighting Arts Batman could realistically have done if he was around in the 1930s & 40s.

A clip from Batman the Animated Series was used within this video. The episode is Night of the Ninja by WBTV.

This video has been re-uploaded due to issues with copyright claims.

Soundtrack Included:

Black Vortex - Scoring Action by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/

Epic Unease by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/

Action Time Bizbaz Studio

Dark City by Audionautix is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Artist: http://audionautix.com/

Elfman Voices (Halloween Music) Audiomagic’s Royalty Free Production Music Library

The New Order by Aaron Kenny