bldsweatters playing vs fish?

I'm just watching Notthistime on pokerstars playing heads up and his opps seems like a fish. This one really takes the cake for me, I even put him on 87.

PokerStars Game #7207496758: Hold'em No Limit ($25/$50) - 2006/11/28 - 01:14:50 (ET)
Table 'Garuda' 9-max Seat #4 is the button
Seat 2: NotThiSTiMe ($11616 in chips)
Seat 4: deerchaser21 ($7714 in chips)
NotThiSTiMe: posts small blind $25
deerchaser21: posts big blind $50
*** HOLE CARDS ***
NotThiSTiMe: raises $100 to $150
deerchaser21: calls $100
*** FLOP *** [6c Kc 4h]
NotThiSTiMe: bets $250
deerchaser21: calls $250
*** TURN *** [6c Kc 4h] [5s]
NotThiSTiMe: bets $650
deerchaser21: raises $1000 to $1650
NotThiSTiMe: raises $1472 to $3122
deerchaser21: calls $1472
*** RIVER *** [6c Kc 4h 5s] [7d]
NotThiSTiMe: bets $8094 and is all-in
deerchaser21: calls $4192 and is all-in
*** SHOW DOWN ***
NotThiSTiMe: shows [8c 7c] (a straight, Four to Eight)
deerchaser21: shows [Ad 8s] (a straight, Four to Eight)
NotThiSTiMe collected $7713.50 from pot
deerchaser21 collected $7713.50 from pot
*** SUMMARY ***
Total pot $15428 | Rake $1
Board [6c Kc 4h 5s 7d]
Seat 2: NotThiSTiMe (small blind) showed [8c 7c] and won ($7713.50) with a straight, Four to Eight
Seat 4: deerchaser21 (button) (big blind) showed [Ad 8s] and won ($7713.50) with a straight, Four to Eight

I don't know the player, but he probably has his reasons for making this call, bluffing outs combined with getting paid of if he hit, etc, don't know the story between them. Also he might make it just because he's upset or tilting. He doesn't have to be a fish. I don't get why bld 3-bets so small here though, unless it's to induce a push.

somewhat related :

looks like bld is getting the shit pwned out of him by rekrul.

I've never seen such fast play in my life. It's a million times more aggro than Holl vs bld.