7 times out of 10 it's because someone puts a dot on you thus making re-capturing the flag impossible. One-two tries to get the flag and whole group dies.
2 times out of 10 it's because it's faster to die and rush mid than avoid explosion or try to outrun it in mid corridors.
1 out of 10 is when someone retakes a BO ninja style but that almost never happens (maybe even 1 out of 20)
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Capturing all three BOs is quite easy in premade vs pug scenarios, seen it happen a lot yesterday when one side dominated.