It was suicidal. But I managed to survive the encounter above bloodied, thanks to the Bard's Majestic Word and that class ability that grants temp HP when you kill an enemy. Was getting 9 THP per kill, IIRC.Pursuit certainly looks better due to retribution being potentially suicidal.
Would it have helped if you have a non-sticky defender?
E.g. chaladin with several distant attacks or shielding swordmage?
The combination of a mark penalty, being punished for not chasing the defender, or ... drawing an OA (and subsequent extra pain) from a pursuit avenger looks like it could be very dirty (and amusing).
Scratch my previous post ... I can't seem to think of any items that grant temporary resist all till end of next turn.
There's heavy armour and shields, but they're not relevant here .. best I can think of is ironskin belt, and that only works against weapon attacks.
Cloak of Resistance (PHB p250) does exactly that. 5 resistance to all until the end of your next turn (more resistance with higher level versions)