When Davros's Daleks attack the human guards working for the Supreme Dalek in the warehouse (at 34 mins), no laser beams can get seen coming from their weapons though the sound can be heard and the humans are falling down dead. Only when a Dalek exterminates three humans at once is a laser seen and the "negative" extermination effect shown.
After checking his escape hatch, Davros says "Now, for the Daleks", and breaks a vial / smoke canister. As the line is spoken, his lips do not move at all.