mario luigi: superstar saga beanstar piece

i need the beanstar from hrhall plz. Now harhall already told me to drink the water and stand on the footsteps. So i put Mario in front and made Mario drink the water so he became fat. then harhall told me to press the B Button so luigi could hammer mario so water would go on the design bomb. However whenever i press B, Mario automaticly turns toward the right the water go towards the right. From then on i cant press any key z,x,a,s,up,dwn,lef,rigt(im playin on gba), so i have to pay Ctrl+L. Plz tell me wat to do to make mario spit water on the designbomb!!!Plzzzzzzzz!!!!!

it's not possible to stand to the right of the bomb? :-\

no, mario's head just automaticly turns to the right and spits out water towards the right, not on the designbomb