No trouble
Lex almost forgot he could fly, but as he had teleported in the diving position, the moment he appeared in Dunya, he almost fell to the ground. Instincts kicked in, and he managed to prevent himself from landing flat on his face, though he did notice that flying was slightly more strenuous here than anywhere else.
Gravity was much stronger here than he was used to. If Lex had to guess, he would say it was about fifteen times stronger than earth.
The spiritual energy was also extremely dense on Dunya, but most importantly, he could feel the weight of the laws around him. They were much heavier and much more complete than any laws he had ever felt before.
They saturated every inch of the world around him, and he could feel them covering his body as well, bringing him under the influence of the laws of Dunya.