WilyB, You cannot be serious asking this question:
Or venting heat and flames outside while they are refueling the 787.
if you knew there was an under bonnet fire in your car as you pulled into the service station, would you attempt to refuel your car?
Give airline staff and airport refuellers a little credit for intelligence.
Besides the presence of a stack of big lime green fire units would probably mean that even the most stupid refueller probably couldn't get close enough anyway.
Wily - you seem to misunderstand the situation here. The 787 after receiving this mod will not be flying around the skies totally oblivious to the little lithium furnace burning merrily away trailing smoke like an old 707 over a period of months. In the rare even of this happening again BEFORE a more permanent fix is found, the box and venting are designed to mitigate collateral damage whilst the crew seek out the nearest safe airport so the emergency services can extinguish the blaze.