We would surely have taken revenge with full force.
We would have punished him.
We would have seized him by the right han
We would certainly have seized him by the right hand
We would have punished/taken from him by the right (hand)
… I (God) would have indeed seized him by his right hand…
We would have definitely taken revenge from him
We would, surely, have seized him by the right hand
We would have seized him with full force and might
We would have certainly seized him strongly by the right hand (and so deprived him of all his power)
We surely should have seized him by his right hand (or with power and might)