Information escape from a black hole

Is the following a possible scenario? If not, why not?

Assume there is a supermassive black hole $Z$ isolated in inter-galactic space. Nearby and stationary relative to $Z$ is observer $A$. A number of light years away spaceship $X$ is travelling at, say, $0.25c$ directly towards the black hole and (eventually) $X$ falls directly into $Z$. $X$'s mass as observed by $A$ will increase as $X$'s velocity approaches $c$ as $X$ approaches $Z$'s event horizon. It seems that $X$'s velocity should be so close to $c$ as it encounters the event horizon of $Z$ that $X$'s apparent mass should cause it to have its own event horizon.

I am assuming that $A$ will observe that $X$ becomes a black hole just prior to its event horizon merging with $Z$'s.

Now assume that just prior to the merging of the event horizons a spaceship $Y$ is travelling a few light seconds behind $Z$ on the same path, but at about $0.5c$. Just prior to the merging of event horizons $Z$ radios $Y$ (to whom $Z$ will NOT appear to have an event horizon) and $Y$ relays this message to $A$. (Note: This could also happen in reverse, so a fast conversation may be possible.)

What is wrong with this, as it appears to anyone stationary with respect to $Z$, that $A$ and $Z$ are communicating, with information being exchanged from within a black hole?

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What you describe is not what observer $A$ would see. Observer $A$ will certainly see the spaceship $X$ accelerating towards the black hole, but as $X$ approaches the black hole $A$ will see $X$ start to slow down and come to a near halt at the event horizon. In fact $A$ will never see $X$ cross the horizon, or more precisely in $A$'s co-ordinate system it takes infinite co-ordinate time for $X$ to reach the horizon.
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