UTG 246 BB (Hero) ( Ah As)
MP 121 BB (Villain)
CO 295 BB
BU 111 BB
SB 129 BB
BB 100 BB

UTG (Hero ) Raises to 3BB
MP Call 3BB
CO Folds
BU Folds
SB Folds
BB Folds

POT = 7.2 BB

FLOAP:
2d Kh 8s

Hero : Check
Villain : Check

TURN:
2d Kh 8s 4c

Hero : Bet = 3.6 BB
Villain : Call = 3.6 BB

POT = 14 BB

RIVER:
2d Kh 8s 4c 2s

Hero : Bet 16.1 BB
Villain : Raise 51.0 BB
Hero : Calls

Villian wins with 4h 4d.

I have no information on this player. When he raises shold i shove river vs 10 NLZ Unknown? I guess folding to his river raise is out of the question?
Or dose just calling in that situation lead to less variance in general?