Crossing the 6 ball is a good, and probably best option. However, it looks like it would be very difficult to make the 8 ball along with it, or even the hanging 4 ball. You will have the ability to make one of them for sure, the 8 or 4 ball. No matter. It would be ok if you did either option (make 6 or make 4), but no harm if you dont. The drawback in making either the 8 or 4 is that now 2 balls are in play. Just enough for you opponent to win, but not enough for youIt's definitely a fair trade off, how would you like to be shooting off the end rail with two balls in play?
You need 3. Just crossing the 6 opens up some pathways to get back into the game.
Example: the cue ball should now be on the bottom rail and the 6 ball should be near the foot rail and close to the 4 ball -- leaving no decent return shot on the 6, probably forcing your oppo to pocket the 8 and leave you long and back on the head rail. Why would anyone pocket the 8 ball? that wouln't be very smart, would it. Or he can bank the 6 ball back up table, then your in trouble again. Two balls are now in play, with one on the spot. Giving you an opportunity to make one of the hanging balls, spotting it behind the 8 ball and hopefully allowing you to return up table and be relatively safe with only the 6 ball leave to worry about. More importantly, there will now be THREE balls in play -- enough for you to win, and putting you back into the game.
Beard
If the 6 ball was a little higher off of the rail I would just thin off of it, making sure I didnt hit and pocket the 8 ball and return my oppo back to the foot rail.
From there I am sure that in a few innings I would have at least three balls in play.