Anchor: A biker reaches the apex of his ramp while onlookers watch his feat.
Entailed: A biker reaches the apex of his ramp.
Contradiction: A roller skater does various tricks off a ramp.
Contradiction: The group is fighting with eachother
Contradiction: That's understandable. 
Contradiction: The girl is playing basketball with her friends.
Contradiction: Very small firms are firms with not more than $3 millions gross revenue for the 3 preceding calendar years.