SNOOT video light - Diving Lembeh 2016

This time i try to snooted my video light. i have been seeing people doing picture with snoot flash light and i always wondering if this also works with video. well as you can see here, it works but the problem when the object start moving out of the light area. This is my first experiment, i hope to get better in years to come. and i do like the effect of snoot video light. thanks for watching... Equipment : camera Sony RX100mk3 uwcasing Nauticam Nauticam SMC and multiplier