Possible Clues:

• What a bop on the head might cause you to do
• React to a sidewinder
• A blow might make one view them on the screen
• Realise celebrities are affected by flashing lights
• Reel from a wallop
• Understands salts show a reaction to punch?
• Be dizzy
• Notices sailors become dazzled
• Gatecrashers at Oscars after-party will no doubt be dazed
• What a big sock might make you do