Nifelhein
First Post
They are interrupt because it interrupts the action, take place and then things continue, the only reason for the action that triggered not to continue would be if it became impossible to do so.
Rules quote below:
Page 268 PHB
Rules quote below:
Interrupt: An immediate interrupt lets you jump
in when a certain trigger condition arises, acting
before the trigger resolves. If an interrupt invalidates
a triggering action, that action is lost. For example,
an enemy makes a melee attack against you, but you
use a power that lets you shift away as an immediate
interrupt. If your enemy can no longer reach you, the
enemy’s attack action is lost.
Page 268 PHB