Big bluff?

[Sabrazack]

This is the first level of the tournament so i have no reads whatsoever. I would like to see what people say here
before i post results and my reasoning. BTW, this was played during the (imo) tougher time of day with 14k ppl online.

***** Hand History for Game 2281527031 *****
NL Hold'em $20 Buy-in + $2 Entry Fee Trny:13504117 Level:1 Blinds(10/15) - Wednesday, June 29, 08:34:52 EDT 2005
Table Table 13786 (Real Money)
Seat 7 is the button
Total number of players : 10
Seat 1: ONTILT32 ( $755 )
Seat 2: redsoxsfan ( $975 )
Seat 3: pkbsalsal ( $25 )
Seat 4: HERO ( $790 )
Seat 5: ripa510 ( $875 )
Seat 6: TheDurk ( $745 )
Seat 7: playnpoka ( $655 )
Seat 8: Entolitator ( $1625 )
Seat 9: mythx ( $770 )
Seat 10: dbmedina ( $785 )
Trny:13504117 Level:1
Blinds(10/15)
** Dealing down cards **
Dealt to HERO [ Kc Ah ]
dbmedina folds.
ONTILT32 folds.
redsoxsfan calls [15].
pkbsalsal folds.
HERO calls [15].
ripa510 folds.
TheDurk calls [15].
playnpoka folds.
Entolitator calls [5].
mythx checks.
** Dealing Flop ** [ Js, Qc, Ad ]
Entolitator checks.
mythx bets [50].
redsoxsfan folds.
HERO raises [150].
TheDurk folds.
Entolitator folds.
mythx calls [100].
** Dealing Turn ** [ 3s ]
mythx checks.
HERO bets [225].
mythx is all-In [605]
HERO ??