Just stay away by flying up... you can pick up things - actually the big round platforms or the square boxes, or even the electric bulb looking things. You throw these at the giant, and eventually he shrinks again. Then hit him and get away-hit him and get away...etc. Btw he gets big again-keep throwing stuff from high up and he won't get ya.

but how do you stay away from the forcefields he projects at you

This warlord place is unbelievably frustrating!

How do you not get hit ny those bloody forcefield things!?

BLOCK

I did it once n i cant remeber how i did it its is so frustrating!!!!!!!!! grrrrrrrrr

when he turns big, pick up pieces of those tower-thingys and wait for him to deploy a
shockwave, then throw it at him. you can do it even when he's shooting those little orbs.
keep that up until he's out cold.