I crash tested my new 15th C armour by accident the weekend before last.
I came off at warp speed when my steed threw a monumental wobbly / hissyfit.
yes you can do breakfalls and rolls in armour and I did one judging by the line of dirt in all the right places. Can't honestly remember doing it but it is a pretty automatic reaction whenever I am falling to try and roll and breakfall.
Saw stars & felt dizzy for a few moments and had to roll onto my knees to catch my breath.
The only bad bit was getting my left foot stuck in the stirrup as I was coming off and I think I cracked several bones in my foot judging by all the black and sore bits.
Its going down now but meant I couldn't kick to save myself all last week and have only just started getting my balance back on that leg this week. To top it off I injured my other hip joint a day later in a couple of freak accidents involving large cardboard boxes and a door frame.
Note to self to remember to check first if cardboard box will fit through door instead of trying to dislocate leg when it gets stuck!
The armour hadnt been tempered yet so our armourer had to re-adjust the curves on it after I had mangled his work.
We are doing a display on Thursday so hope it all comes right before then!