They said, "Come on!" But who is the object of this word "Lai"? Who is the person who heard the next sentence? What you hear should be non-believers, because all believers are already included in the bride.
If so, their answer should be "I will come" instead of turning to Christ or other believers and saying "come". Another possibility is that the person who heard it refers to individual believers, and their request for "arrival" is for Christ.
The advantage of this view is that the idea is the same as the following, because the last few verses are asking Christ to come back as soon as possible (verse 20), but the difficulty is that in the same sentence, the target of the speech suddenly changed from Christ to unbelievers, because there is no doubt that the target of the second half will be unbelievers.
Therefore, I think it is more appropriate to regard the word "come" as an invitation from the church and every believer. Next is the content of the invitation, and those who are thirsty will come); Also, anyone who wants it can get water for free. As long as you are aware of your needs, no matter how deep they are, they can be met.