Two things: No mention of bash infinitely linking into itself, and about slow weapons

First of all, keep in mind that Bash is fairly new. Second, I tested both a Fomor Warhammer and a Fomor Francisca myself, both slow weapons while naked and Rank 8 Bash, neither were able to double hit. Thirdly, the "infinite combo" doesn't require double hitting; it's because Bash is incredibly fast and it has no cooldown, combined with its long stun makes the opponent incredibly vulnerable.

Spamming bash on cooldown and infinitely double linking are different in what they accomplish. The double link yields much higher damage output and will be superior whenever not trying to get training counts as fast as possible. I'll revise. Xaishen (talk)

In any case, I'm not getting the double hit on my two slow weapons at all. Are you absolutely sure you aren't just linking to a standard normal attack?

Either that or it's possible but significantly harder to do.

The timing is strict but it's entirely doable. A fighting game player with experience linking a tight combo would be able to catch onto it rather easily. The trick is not to mash click but to time it. You'll never link it by mashing the mouse button. I'll post a link to a video somewhere if my toaster will allow it. It definitely isn't a normal attack; dual-wielding makes the animation difference very distinguishable.

EDIT: The webM can be found at the website WebmUp with the video id 00795. Copypaste it after the first forward slash in the url, like webmup(dot)com/xxxxxx. The video demonstrates rank 6 but rank has no effect on being able to combo bash.

I see. I've already heard others claim slow speed is possible (along with some people doubting its existence).

After trial and error I managed to pull it off. However, that incredible difficulty and precise timing is too important of a detail to leave unmentioned.