behind
at the back of, as to be hidden;
slower or later than someone else;
responsible for or the cause of

see another keyword links:
back

hidden

slow

late

responsible

cause

back, behind
after, afterwards

offstage
backstage
behind the scenes

pushing hands
backstage driving force

impetus
driving force
actuating force

catch up from behind
latecomers surpass the early starters

sight of one's back
view of somebody's back
figure viewed from behind