Two men kick in the air at each other on a grassy area , while another man watches them in the background .
It is almost certain that the two martial arts students spar on the lawn , while an instructor looks on .
There is almost no chance that the two martial arts students spar on the lawn , while an instructor looks on .
It is almost certain that the two martial arts students spar on the lawn , while an instructor looks on .
The two martial arts students spar on the lawn , while an instructor looks on .