Two tugs on the fly line

[thorarinna]

Hi.

I went fishing last Saturday, not a big thing but I recall getting a tug on the fly line and then another one half a second or one fourth of a second later.
I have often had those two tugs when fishing and started thinking of what it could be.
I was using a nymph.

Is it the fish getting cought f.ex in the left sissors, he then turning to the right and immediately releasing him self...???

Just wandering,
Thorarinn.