Hi Zig Zag,
there’s a way of leashing off on the black webbing ReRide handle you can find on some bars. That handle pulls in one front line and thus flags the kite. Similar to an OSH but front stead of back line.
Since 2011 the location of this handle moved up to about 2,5m (not even sure if it’s still there) as the kite’s from then on have a roll over bridle, that effectively flags the kite on both front lines. That’s too far away to leash off on.
So if the center line fails, and there is nothing above the center line connected to a leash, your kite is gone. The freestyle and fusion bar have a leashed mini 5th line that will catch the kite for your. The freeride bar (my favorite) doesn’t.
To avoid centerline breaking, check the line regularly and replace in case of doubt. To reduce wear, you can try wax on that line.