Derek McInnes insists his side needs to take more responsibility after a second-half winner sent Arbroath four points clear at the top of the cinch Championship.
The Kilmarnock gaffer suffered his first defeat in the league since taking charge at Rugby Park early last month when Jack Hamilton's shot squirmed through the gloves of keeper Zach Hemming.
Part-timers Arbroath were reduced to 10 men in the dying minutes when substitute James Craigen saw red for a lunge.
