This is most likely a reference to the film Kiss of Death (1947), in which Widmark's character (a gleefully psychotic killer) pushes a wheelchair-using elderly woman down a flight of stairs to her death.
To može biti referenca na film Poljubac smrti iz 1947., u kojem Widmarkov lik (psihotični ubojica) ubija staricu prikovanu za invalidska kolica gurnuvši je niz stube.