After many attempts on replicating my previous Chimera (18 segs) I found a way to make it even faster but not consistant, so this is the strat at the start charge at the chimera to proc 1 of attacks (Firebreath or Leap) if you get firebreath do one squere combo and finish with triangle after that try to position Ed behind the chimeras legs an keep repeating combo while Al takes all the damage, remember to command him to attack the chimera to do even more damage. If you get the leaping start but hitting him with square combos only (don't end them) after that the chimera will leap and that is you best change to get him with the one square triangle combo and try to stray behind his legs at all times.