Aggressive big-stack move or donky play?

[Rocco]

Having the biggest stack gives you a great opportunity to bully around, especially when nearing the bubble. I don't know how you guys play the big stack, but I tend to get aggressive with my good hands, raising pre-flop limpers a lot etc etc...

In one of yesterday's $5 R+A tourneys at Party I witnessed a crazy big-stack. Or is this standard aggressive play to you?

Blinds: 750/1500
Players left: ~140
Players paid: ~120

UTG+1: T35000
CO: T20000
SB (big-stack): T60000
BB: 18000

SB's hand: Q9o

UTG+1 limps and so does CO. SB completes and BB checks. Flop comes J [img]/images/graemlins/club.gif[/img] T [img]/images/graemlins/diamond.gif[/img] 5 [img]/images/graemlins/club.gif[/img]. SB does not have a club as far as I remember (was of course browsing 2+2 while playing).

Action: Both blinds check... UTG+1 bets out 2/3 (4000)... CO folds... SB calls... BB folds

Turn: some low rag

Action: SB checks... UTG+1 bets 10000... SB goes all-in...

UTG+1 had been playing pretty solid poker as far as I'm concerned. Is this a standard move taking FE, bubble play closing in and the fact that UTG+1 could be on a flush draw or lay his hand down, into play?