Answer:
The speaker and those present expect to feel something striking, but that sensation is hindered by the presence of a fly that attracts everyone's attention.
Step-by-step explanation:
The speaker is portraying the moment of his own burial, where he tries to make it a grand event, as well as those present. As death is a sad moment, the speaker expects everyone to be impacted, to feel strong emotions and to regret the match, but none of this happens because the presence of a fly gets in the way and attracts everyone's attention.