This was a smart move, as Tywin was focused on Royal who was now terribly wounded. Royal was distracting Tywin, actually, by his continuous fire upon the skeleton. This granted Lyn her opening as she bashed the crystal, and it cracked severely and was chipped in multiple places. Tywin's head did a complete 180 degree turn and he looked down at Lyn, it's fiery eyes extinguished for a longer moment before he swung his blade back, crashing the blade into her ribs and chopping into the armour, as well as her skin. The blow made her body rag doll down, and as she fell Tywin leapt back fifty feet with a smash against the bridge.