OK, so the Gatherer page for Boros Reckoner says
|1/24/2013||Boros Reckoner’s first ability will trigger even if it is dealt lethal damage. For example, if it blocks a 7/7 creature, its ability will trigger and Boros Reckoner will deal 7 damage to the target creature or player.|
|1/24/2013||Damage dealt by Boros Reckoner due to its first ability isn’t combat damage, even if it was combat damage that caused that ability to trigger.|
The first rule suggests that when blocking, Reckoner absorbs all the attacking creature's power, even beyond tithe amount required to kill it. Does this happen if the attacking creature has trample? Or does the damage done above Reckoners toughness go to the player as usual? If so does Reckoner still deal the full amount (7 in the example) of bite back to the target?