When the people discover that the market plummets, they begin to exhibit fear of missing out and from there you begin to discover about some as well who were anti bitcoin to begin to spread false news about bitcoin, all because they are not investing and they will also like to use that bearish trend to discourage others from investing, so that they all can be on the same zone as losers, but those that knows what they want and whom they are, they don't give much attention to social media buzz about bitcoin and focus on what they are doing.
The word "plummet" means for something to fall, decline, drop but the context you tried to make is for the market to pump, that word isn't right here. However, what you say here is truth about people reaction to the market. You will see people begin to have fear of missing out on the market as soon as they see Bitcoin running and the people that doesn't feel happy about the market spread bad news just to discourage others and also make it drop by force.
One thing about Bitcoin force is this, if the market want to run, there is nothing stopping it from doing it unless there is a heavy storm of news that is going to kill that hype and such news must be something the market hasn't experience before because right now, the market doesn't really fear anything from the main stream media, Bitcoin is standing on business now unlike back the where people do chicken out because of small news.