Kynigo was confused. He didn't know what to do. So his *bleeped out due to spoilers* instincts took over and he jumped towards the tendril. He carefully sliced at the nucleus, and when it started to fall out, he grabbed it, and threw it towards the entrance of the room. He then threw his twin daggers at it, piercing it.
((This does not mean he killed it, the next poster may decide if it's dead or not.