donkbet why?

[sh58]

i have seen donkbets in 3bet pots before and they are almost always weak

so why this line here. villain has no reads on me as i have just sat and we haven't played before. if he datamines he probably sees me as 22/18. i have him as 18/18/4 over 200 datamined hands

Party Poker, $1/$2 NL Hold'em Cash Game, 5 Players
LeggoPoker.com - Hand History Converter

CO: $47
sh58 (BTN): $200.80
SB: $343.85
BB: $366.45
UTG: $260.75

Pre-Flop: Q[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] dealt to sh58 (BTN)
<font color="red">UTG raises to $7</font>, CO folds, <font color="red">sh58 raises to $22</font>, 2 folds, UTG calls $15

Flop: ($47) 7 6 8[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">UTG bets $31</font>, <font color="red">sh58 raises to $85</font>, <font color="red">UTG raises to $238.75 and is All-In</font>, sh58 calls $93.80 and is All-In

Turn: ($404.60) 5 (2 Players - 1 is All-In)

River: ($404.60) 6 (2 Players - 1 is All-In)

Results: $404.60 Pot ($2 Rake)
sh58 showed Q[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (two pairs, Queens and Sixes) and WON $402.60 (+$201.80 NET)
UTG showed T[img]/images/graemlins/spade.gif[/img] T (two pairs, Tens and Sixes) and LOST (-$200.80 NET)

is he inducing a raise?

does anyone out there donkbet in 3bet pots, cos i don't understand why people would do it 100BB deep?