What? There wasn't a trap on Broadway. The bridge goes up, Javert "falls" and there's a "water" light effect while he "drowns" (rolls). It can look silly or impressive, depending on the actor.
I once saw a LMSE where the Javert did a swan dive off the back of a structure and I assume there was some impressive padding back there, and another where the kid leapt off of a precariously hanging beam onto a mattress somewhat disguised by dry ice. While the first was somewhat impressive, I can't say that either was a great improvement over the professional concept. It'd be interesting to see a different effect in the professional production, but I'd be a bit afraid of the hijinks that could result (or possible injury).
'"Contrairiwise," continued Tweedledee, "if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."'
~Lewis Carroll