lost double strike bug?

I didnt find this bug in previous post, so hope doing it right, if not just ignore it.
I explain with an example:
AI is attacking with a Silvercoat lion paired with a Silverblade paladin so they both have double strike.
I block lion with a boros reckoner.
On the FS phase boros get 2 damage and redirect it to paladin who die then lion has no double strike anymore.
Then on the CD phase, according to the manual (read below), lion cannot deal combat damage only boros can, lion should die and boros would survive.
On forge 1.4.3 lion deal another 2 damage on CD phase and boros die.
510.5. If at least one attacking or blocking creature has first strike (see rule 702.7) or double strike (see
rule 702.4) as the combat damage step begins, the only creatures that assign combat damage in that
step are those with first strike or double strike. After that step, instead of proceeding to the end of
combat step, the phase gets a second combat damage step. The only creatures that assign combat
damage in that step are the remaining attackers and blockers that had neither first strike nor double
strike as the first combat damage step began, as well as the remaining attackers and blockers that
currently have double strike. After that step, the phase proceeds to the end of combat step.
Thanks for your attention.
I explain with an example:
AI is attacking with a Silvercoat lion paired with a Silverblade paladin so they both have double strike.
I block lion with a boros reckoner.
On the FS phase boros get 2 damage and redirect it to paladin who die then lion has no double strike anymore.
Then on the CD phase, according to the manual (read below), lion cannot deal combat damage only boros can, lion should die and boros would survive.
On forge 1.4.3 lion deal another 2 damage on CD phase and boros die.
510.5. If at least one attacking or blocking creature has first strike (see rule 702.7) or double strike (see
rule 702.4) as the combat damage step begins, the only creatures that assign combat damage in that
step are those with first strike or double strike. After that step, instead of proceeding to the end of
combat step, the phase gets a second combat damage step. The only creatures that assign combat
damage in that step are the remaining attackers and blockers that had neither first strike nor double
strike as the first combat damage step began, as well as the remaining attackers and blockers that
currently have double strike. After that step, the phase proceeds to the end of combat step.
Thanks for your attention.