200/400 stars.......Strange hand

[ndgrinder59]

I've been struggling lately at the 30/60 and 50/100 LHE games so I decided to take a night off and watch some of the bigger games, when this hand came up.........

PokerStars Game #9722455118: Hold'em Limit ($200/$400) - 2007/05/02 - 22:46:13 (ET)
Table 'Industria IV' 6-max Seat #6 is the button
Seat 3: AlexSem ($15411 in chips)
Seat 5: tiger76 ($11380 in chips)
Seat 6: DonkofDonks ($5086 in chips)
AlexSem: posts small blind $100
tiger76: posts big blind $200
*** HOLE CARDS ***
DonkofDonks: raises $200 to $400
AlexSem: raises $200 to $600
tiger76: folds
DonkofDonks: calls $200
*** FLOP *** [5s 8d 3h]
AlexSem: bets $200
DonkofDonks: calls $200
*** TURN *** [5s 8d 3h] [Jd]
AlexSem: bets $400
DonkofDonks: raises $400 to $800
AlexSem: calls $400
*** RIVER *** [5s 8d 3h Jd] [Ks]
AlexSem: checks
DonkofDonks: bets $400
AlexSem: raises $400 to $800
DonkofDonks: calls $400
*** SHOW DOWN ***
AlexSem: shows [Kd 9c] (a pair of Kings)
DonkofDonks: mucks hand
AlexSem collected $4998 from pot
*** SUMMARY ***
Total pot $5000 | Rake $2
Board [5s 8d 3h Jd Ks]
Seat 3: AlexSem (small blind) showed [Kd 9c] and won ($4998) with a pair of Kings
Seat 5: tiger76 (big blind) folded before Flop
Seat 6: DonkofDonks (button) mucked


I'm not in any way calling AlexSem out on this hand b/c I know he is a solid winning LHE player, but I am just trying understand the thought process on calling the turn raise...what range did you have your opponent on were you calling river if you didn't spike...ext