One problem with this calculation is it only accounts for 64 Orkans and 34 Pinatas. It doesn't factor into how many rockets are reloaded and fired prior to emptying the weapons.
Also, I would venture to guess that by "one volley" he's actually talking about a full volley plus 2-3 additional seconds of reload fire after they're empty.
Ask and you shall receive. I’m going to make the assumption that the reload mechanic is automatically loading and shooting…
Orkans
(Rockets per second based on reload time and capacity) 32 Rockets / 23 Seconds Reload = 1.39 Rockets Shot per second (constant fire mechanic)
(How many additional rockets are shot during the Orkan unload) 3.2 seconds to unload / 1.39 Rockets Shot per second = 2.3 rockets fired during unload
(Damage of the additional rockets shot due to constant reload) 2.3 rockets * 1890 damage per rocket = 4347 damage
(Multiplied by 2 for the pair of Orkans) 4347 * 2 Orkans = 8694 total additional damage
Pinatas
(Rockets per second based on reload time and capacity) 17 Rockets / 15 Seconds Reload = 1.13 Rockets Shot per second (constant fire mechanic)
(How many additional rockets are shot during the Orkan unload) 3.2 second Orkan’s unload / 1.13 Rockets shot per second = 2.83 rockets fired during Orkan unload
(Damage of the additional rockets shot due to constant reload) 2.83 * 1386 damage per rocket = 3922 damage
(Multiplied by 2 for the pair of Pinatas) 3922 * 2 Pinatas = 7844 total additional damage
(Total additional damage) Orkans 8694 + Pinata 7844 = 16538 additional damage
(Added to the initial unload) 168084+16538=184622
(Remaining health of Leo based on recalculated DB strike) 199000 – 184622 = 14378 remaining health
(Proportion of health as compared to our damage dealt from the 3.2 seconds of loading mechanic rockets) 14378/16538= 0.869391704
(Multiplied against Orkan unload time, we have the remaining time needed to deplete remaining Leo health) 3.2*0.869391704 = 2.78 seconds of additional fire
(Total time to kill the Leo) 3.2+2.78 = 5.98 seconds
5.98 seconds to kill a 199k HP Leo is getting close to double the unload time. Still no way that much damage can be compressed into 3.2 seconds. Additionally, I make a major leap that the DB he was facing was maxed out. Each additional level that the weapons were below 12 significantly impacts these time horizon calculations. Still doesn’t jive to me that a 199HP bot was insta killed by a DB Griff (unless there’s another damage bug we haven’t noticed).