After taking a look at the peak it seems that it is 7x higher than the background (figure 1).
After looking at what events cause this peak it seems like only coincident events cause it, those that have bigbite and one of the 2 arms. In fact cutting on this peak and trigger type 5 gives the triple coincidence.
This makes sense, as we expect the raw data in bigbite to "bunch up" and create a peak where the most events concerning bigbite happens. This peak seems to be expected, and I will double check with Brad that this is what we should be getting.
Either way, there it is, looks like the coincidence peak between bigbite and the arms.
Figure 1
Figure 2