Before/ ago!

Which fits best in the following sentence and if possible please tell me also why?

  1. That was a very scary moment for me when I didn’t find a lizard on my room’s wall which I saw two seconds before?

  2. That was a very scary moment for me when I didn’t find a lizard on my room’s wall which I saw two seconds ago?

Thanks in advance!

Regards

Mirch.

  1. works best. If you were to say ‘before’ you would have to have an indication of what it came before.

Thanks! :slight_smile: