PLO/8 Promo Raising the Flop

[TGoldman]

What do you think of this type of promo raise on the flop? I have a weak/medium strength hand in both directions, so I raise MP2's weak looking bet hoping to get it heads-up with position. Is this a raise or fold situation? And if so, is the raise with the risk?

PokerStars Pot-Limit Omaha/8, $0.50 BB (8 handed) converter

MP2 ($73.75)
CO ($39.65)
Hero ($50.70)
SB ($18.90)
BB ($35.75)
UTG ($42.75)
UTG+1 ($16.30)
MP1 ($25.95)

Preflop: Hero is Button with 4[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls $0.50, <font color="#666666">1 fold</font>, MP2 calls $0.50, <font color="#666666">1 fold</font>, Hero calls $0.50, SB completes, BB checks.

Flop: ($2.50) 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG+1 checks, <font color="#CC3333">MP2 bets $0.5</font>, <font color="#CC3333">Hero raises to $3.9</font>...