When I was learning WT from @yak sao , the concept was just to try hitting the opponent in the face. The arm bridge was just something that happened and that you had to deal with if the opponent put their arms in the way. It wasn't something that you sought out intentionally.Something to keep in mind is that not all WC intentionally seeks "arm contact" as a first encounter. IMO, the first encounter or physical exchange is my fist landing on his face, or my kick impacting its target...then it unfolds from there.