Tower defense
Sam waited in the desolate land for some time, maybe thinking that the other battles would be over. But the wait went on and on. There is no day or night in that field, he sat there, he rolled over and he even slept for some time.
He almost lost the sense of time after a while. After some time, he figured he might as well train and started the body refining. Even though he works every day with so many things, he always trained for some time in one way or another. Just that he wouldn't spend as much time as the rest of his peers.
But now that he got a lot of time and an environment with the spiritual energy of higher density than his regular atmosphere, he might as well use it.
He doesn't know how long he trained, but he kept on refining his body and practiced his combat techniques.
After who knows how long, he was finally woken up from his stupor. Karthikeya's silhouette appeared once again and Sam wore his clothes back and started restoring his energy.