Let's be honest -- Centaur might have never amounted to anything based on the issues I've reviewed so far here. But with Funny Picture Stories #4, here, we see the infusion of relevance with the arrival of Will Eisner. The Brothers 3 will not stand the test of time as great literature, but we begin to see a cinematic elegance here that will become one of Eisner's trademarks.
Note that hardly anyone in this deadly firefight is dodging for cover. Everyone seems to be counting on bad dice rolls! Since our good guy is apparently dodging 12 attack rolls in this first turn, he is either extremely lucky, or is a player-controlled Hero getting his save vs. missile for each bullet.
We also get some idea here about how many bandits should be encountered together.
mentioned previously, there is the penalty to hit based on speed for vehicular combat, offset only barely by the +1 situational modifier he would gain for attacking from above. If the bandits had not failed their morale saves, he would still be a target to retaliatory shots fired (though he would have the benefit of both hard cover from the plane and his save vs. missiles for evading gunfire).
Also, though I would treat the damage as cumulative for however many grenades are in the sack, I would not treat the area of effect as cumulative.
(Scans courtesy of Comic Book Plus)