His first attack hits, but he doesn't have time to ensure he killed the hollow. He sprints for the nearest archer, and makes a desperate thrust with his longsword.
Channeling divine energy so many times is taxing on one's, and Tosti feels his nerves frying with every slash.
Rolls
Sword Attack 1 - (1d20+6)
(18) + 6 = 24
Potential Damage 1 - (3d8+5)
(278) + 5 = 22
Sword Attack 2 - (1d20+6)
(7) + 6 = 13
Potential Damage 2 - (3d8+5)
(481) + 5 = 18