(adsbygoogle = window.adsbygoogle || []).push({});
When you are arming the bomb or defusing the bomb hold the Left Trigger, and after you are done arming/defusing you will throw a "fake" C4. The C4 won't blow up and you can't detonate it...it is just a fake to scare off opponents.
If you plant a claymore, then when your planting the second one, start planting (before your gun comes out) then after that stand up, and press one of the triggers. You do exactly the same with the C4..