VILLAIN has $122 and I cover him. I also have the button.

SB posts the small blind of $1
BB posts the big blind of $2
The button is in seat #3
*** HOLE CARDS ***
Dealt to HERO [4c 5c]
3 fold...
1 calls $2
VILLAIN calls $2
HERO calls $2
SB calls $1
BB checks

*** FLOP ***

3 check,
VILLAIN checks
HERO bets $10
3 fold...
VILLAIN raises to $25
HERO calls $15

*** TURN ***

VILLAIN bets $25
HERO calls $25

*** RIVER ***

VILLAIN has 15 seconds left to act
VILLAIN bets $50
HERO raises to $70.40
VILLAIN calls $20.40, and is all in

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Results / Comments in white

So he checked the flop on the small chance that the only person behind him (me) would bet at it, and check-raised either because he thought I was bluffing or because he has a hand. Turn is gin for me, but I figure if he has a set he's going to put his whole stack in anyways, so I might as well let him continue bluffing if indeed he is. So I just call. River fills up any set but is this small reraise to get his whole stack still +ev? He said "sick... sick..." in chat and called with 22.