I'd imagine not completing that twist at the end of the second part of the dismount (basically doing a cross handstand, turning to a side handstand and instead of twisting to the other side like in L4/L5 just coming straight down like L3) would count as a fall...so I'd say at least .5. In L5 I believe our girls were instructed to get back up and do it again if that happened at a meet, but not sure what it would mean in L6. Surprisingly, I don't think any of our girls did that in any of our meets, however, they would do it a lot in practice (it's actually pretty likely to happen for some of them, like my DD, when they try really hard to hold the cross handstand for a long time like you are supposed to). At meets they'd all play it safe and turn really quick.