I very much doubt it for two simple reasons.
(a) that's not Roy. Even on his worst day, I do not see Roy choosing to take a gamble that MIGHT result in him murdering a baby if Greg might stand up and move to the left. Greatsword tosses have travel time. He cant' KNOW that an off-center throw is safe.
(b) leaving aside personal mores, if that did anything to Hilgya, it would probably result in Hilgya unloading ALL her firepower.... ON ROY.... as it would be ROY who threw a sword in the general direciton of her baby. THAT would get the aggro, not Greg sitting there with the baby in his lap.