Hrothrun was surprised--the quarterstaff had much longer reach than he was expecting. He took a few smarting hits before adjusting his defense, then ducked and pushed in close, using his shield to try and push Idranel off balance before following with a counterattack.

Spoiler: Rolls!
Show
I'll roll one as a two-handed attack--shield bash immediately followed by hammer. The other two attacks are just the hammer.

(1d20+11)[15] (shield)/(1d20+13)[21]
(1d20+15)[20]
(1d20+15)[30]

Not necessarily specific attacks, also an approximation of effectiveness.