Yes it's a Seneca ; ) I have had an engine vibration a few times in the 3000 hrs I had in them and worse! One observation is an engine vibration can appear to be from both when it's from one and you do need to get up to a safe altitude and work out what's happening and from which engine!
This guy appears to have thought oh my God both engined are vibrating I have to get it down before they both stop!
Our of control approach! Land at all costs with the inevitable off the end if the runway oh well : ( thankful no one was hurt
Act in haste repent in leisure springs to mind
Pace