How to modify properties of C structs from Lua

[pancelor]

I want to teleport a random enemy to the starting room when I press the bomb button.

Here's my mod:

necrolua.hook("c_Player::p_UseBomb", function(func, self)
  print "c_Player::p_UseBomb"

  print "inside mod 1"
  local m_GetRandomEnemy = necrolua.get("c_Enemy::m_GetRandomEnemy")
  print "inside mod 2"
  local enemy = m_GetRandomEnemy()
  print "inside mod 3"
  enemy.x = 0
  enemy.y = 0
  print "inside mod 4"
  func(self)
end)

When I press the bomb button, it crashes:

c_Player::p_UseBomb
inside mod 1
calling nl_symbol("c_Enemy::m_GetRandomEnemy")
[←[33mNecroLuaAPI.dll←[0m][←[32mLua←[0m] nl_luainit.lua:429: nl_get :: cast("__cdecl c_Enemy* (*)()", 20917504)
inside mod 2
inside mod 3
mods\0luatest\lua\init.lua:22: 'struct c_Enemy' has no member named 'x'
stack traceback:
        mods\0luatest\lua\init.lua:22: in function <mods\0luatest\lua\init.lua:14>
        [C]: in function 'xpcall'
        nl_luainit.lua:456: in function <nl_luainit.lua:455>
[←[33mNecroLuaAPI.dll←[0m] nl_payload.c:176: Mod API finalized.
[NecroLua.exe] nl_launcher.c: 58: Done with exit code 0x00000001

I seem to have successfully called GetRandomEnemy from lua, but I don't know what to do now.