The four men in order to avenge Lucy's death, vow to kill Dracula.
That night when the four men go to Lucy’s grave they find it empty. Van Helsing seals the door of the tomb with communion wafers to prevent the vampire Lucy from reentering.
The men then hide in wait. After sometime they see a figure appears which is dressed entirely in white and carrying a child. It can be Lucy or rather, a monster that looks like Lucy.
So, the men then starts surrounding her and she drops the child and calls out passionately to Holmwood, telling him to come to her. Holmwood begins to move, but Van Helsing comes between them and brandishes a crucifix. Thus, Lucy recoils and slips through the door of her tomb.
Thus, having witnessed this horror, the four men in order to avenge Lucy's death, vow to kill Dracula.
Hence, the answer was given and explained above.
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