The Dink Network

I created something like this yesterday actually, although not for a summon spell. First off missing semi-colons might be causing problems (they definitely will, but perhaps not this problem)

int &mapnum
int &mholdx
int &mholdy
&mapnum = &player_map

Further, I think the problem is that you aren't setting &mapnum = &player_map inside the loop. You need to constantly check to see if you switched screens, not just check initially... the script doesn't restart on a map switch.

loop:
wait(25);
if (&mapnum != &player_map)
{
//Do all your checks to see if summon is active. If not, kill the summon var and skip to the end
goto end;

//looks like we switched maps, time to create the beast again
...
//make beast code here
...
}

//now set the &mapnum to &player_map.
&mapnum = &player_map;

//after you restart the loop, if you change screens in the next 25ms then the beast will be re-summoned (created)
goto loop;

end:
//reset vars if needed
kill_this_task();