The two Umber Hulks are very quick, trained warriors, with multiple attacks and AOOs. They may have been easy for Sheerak1 to take down, but trifling… no.
However, especially in size Fine, all five of group1 who fly over them are so hard to hit (AC+8), and can make use of the training that Janis gave them in aerial evasion (AC+2), and have a base of AC16 instead of AC10 from Earth Elemental Form still in Effect, in addition to their usual AC, that only a N20 will do it.
In sequence of passage, here are the rolls, for each character passing over the two Umber Hulks: (1) for Umber Hulk Moe, a to-hit roll, plus a confirming roll and two damage rolls in case of an N20, followed by (2) the same four rolls for Umber Hulk Curly
Ror1:
Umber Hulk Moe
AOO 1d20+11 : 5 + 11, total 16
Confirm 1d20+11 : 19 + 11, total 30
AOO Damage 3d6+15 : 6, 5, 3 + 15, total 29
Crit Damage 3d6+15 : 3, 6, 6 + 15, total 30
Umber Hulk Curly
AOO 1d20+11 : 5 + 11, total 16
Confirm 1d20+11 : 13 + 11, total 24
AOO Damage 3d6+15 : 3, 6, 2 + 15, total 26
Crit Damage 3d6+15 : 3, 4, 1 + 15, total 23
Halfaz1:
Umber Hulk Moe
AOO 1d20+11 : 4 + 11, total 15
Confirm 1d20+11 : 14 + 11, total 25
AOO Damage 3d6+15 : 2, 4, 1 + 15, total 22
Crit Damage 3d6+15 : 1, 5, 1 + 15, total 22
Umber Hulk Curly
AOO 1d20+11 : 15 + 11, total 26
Confirm 1d20+11 : 10 + 11, total 21
AOO Damage 3d6+15 : 3, 2, 4 + 15, total 24
Crit Damage 3d6+15 : 6, 2, 6 + 15, total 29
Halt1:
Umber Hulk Moe
AOO 1d20+11 : 6 + 11, total 17
Confirm 1d20+11 : 12 + 11, total 23
AOO Damage 3d6+15 : 5, 3, 6 + 15, total 29
Crit Damage 3d6+15 : 1, 5, 3 + 15, total 24
Umber Hulk Curly
AOO 1d20+11 : 18 + 11, total 29
Confirm 1d20+11 : 19 + 11, total 30
AOO Damage 3d6+15 : 2, 3, 1 + 15, total 21
Crit Damage 3d6+15 : 2, 1, 5 + 15, total 23
Tanatou1:
Umber Hulk Moe
AOO 1d20+11 : 14 + 11, total 25
Confirm 1d20+11 : 15 + 11, total 26
AOO Damage 3d6+15 : 2, 5, 3 + 15, total 25
Crit Damage 3d6+15 : 1, 5, 2 + 15, total 23
Umber Hulk Curly
AOO 1d20+11 : 7 + 11, total 18
Confirm 1d20+11 : 12 + 11, total 23
AOO Damage 3d6+15 : 3, 6, 6 + 15, total 30
Crit Damage 3d6+15 : 3, 2, 2 + 15, total 22
Vir1:
Umber Hulk Moe
AOO 1d20+11 : 13 + 11, total 24
Confirm 1d20+11 : 4 + 11, total 15
AOO Damage 3d6+15 : 3, 6, 5 + 15, total 29
Crit Damage 3d6+15 : 1, 1, 3 + 15, total 20
Umber Hulk Curly
AOO 1d20+11 : 20 + 11, total 31
Confirm 1d20+11 : 16 + 11, total 27
AOO Damage 3d6+15 : 3, 3, 5 + 15, total 26
Crit Damage 3d6+15 : 4, 1, 1 + 15, total 21
Any N20s above by an Umber Hulk will result in the corresponding damage roll and possible Crit damage to the character.