Q: "Two people dressed in battle gear, are practicing sparring in a gymnasium." Does this mean that "Two people practicing for a school event."?
A: it is not possible to tell

Q: "People of varying height are crossing the street." Does this mean that "One man is standing on the stairs"?
A: no

Q: "A man in a wetsuit gliding through the ocean with one sail." Does this mean that "A man on the ocean on a boat."?
A: yes

Q: "A van with flags advertising floats, boogie boards, umbrellas, chairs, and surfboards." Does this mean that "The van, covered with signs, also has some front end damage"?
A:
it is not possible to tell