The printed accompaniment gives you a basic idea, but perhaps this “roadmap” will make it clearer.

1 - Intro - Play the refrain, stopping at the fermata.

2 - Then play it again as the cantor sings it, but don't stop at the fermata; keep playing to the end of the line and go back to the beginning of the line while everyone sings the refrain, stopping at the fermata.

3 - Accompany the cantor in the verse. At the end of the verse, play the bridge (re-establishing the rhythm) and then play the refrain again, stopping at the fermata.

4 - Same thing for all the remaining verses. 

So you only play the lick at the end of the top line once. After that it's verse, bridge, refrain, stop. The purpose of the bridge is to bring the congregation back in singing their part after each psalm verse. There's no bridge from the end of the refrain into the start of the next verse.

If you're accompanying on an organ, perhaps move to a quieter registration manuals-only to accompany the solo cantor, then to something more beefy with pedals at the bridge to accompany everybody singing the refrain.

These psalms are not meant to be sung by a choir or group of people. They are for solo cantor and congregation.